CN-121979350-A - High-precision separated type multi-power rail power supply system for digital-analog hybrid chip

CN121979350ACN 121979350 ACN121979350 ACN 121979350ACN-121979350-A

Abstract

The invention discloses a high-precision separated multi-power rail power supply system for a digital-analog hybrid chip, which relates to the technical field of microelectronics and comprises an enabling circuit module, a linear voltage stabilizing module, a VCC power supply module, a band gap reference module, an oscillator module, a charge pump module, a VCC power supply module and a VCCx power supply module, wherein the enabling circuit module is used for outputting an enabling signal, the linear voltage stabilizing module is used for outputting a stable first direct-current voltage, the VCC power supply module is used for outputting a VCC voltage, the band gap reference module is used for outputting a reference voltage, the oscillator module is used for outputting a periodic alternating signal, the charge pump module is used for outputting a stable second direct-current voltage, and meanwhile, the VCC power supply module is used for outputting a plurality of VCCx_GATE signals. The invention realizes the voltage output of multiple power rails through the control of the single constant voltage loop, and meets the requirements of digital-to-analog conversion chips on different voltage domains.

Inventors

LI YONGYUAN
YU LINYUN
JIANG RUOYU
GUO WEI
ZHU GUANGQIAN
QIAN LIBO
ZHU ZHANGMING

Assignees

西安电子科技大学

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1.A high-precision separated multi-power rail power supply system for a digital-analog hybrid chip is characterized by comprising: the system comprises an enabling circuit module, a control circuit and a control circuit, wherein an input end of the enabling circuit module is electrically connected with a system power supply end and an external enabling command voltage end, and is used for responding to the system power supply and the external enabling command voltage and outputting an enabling signal; The input end of the linear voltage stabilizing module is electrically connected with the output end of the enabling circuit module, and is used for outputting stable first direct-current voltage in response to the enabling signal; The input end of the VCC power supply module is electrically connected with the output end of the linear voltage stabilizing module, and responds to the first direct current voltage and is used for outputting VCC voltage; the input end of the band-gap reference module is electrically connected with the output end of the linear voltage stabilizing module, and responds to the first direct-current voltage and is used for outputting reference voltage; The oscillator module is electrically connected with the output end of the reference band gap module at one input end, and is electrically connected with the output end of the VCC power supply module at the other input end, and is used for outputting a periodic alternating signal in response to the reference voltage and the VCC voltage; The input end of the charge pump module is electrically connected with the output end of the oscillator module, and is used for outputting a stable second direct-current voltage in response to the alternating signal; meanwhile, the input end of the VCC power supply module is electrically connected with the output end of the charge pump module, and responds to the second direct current voltage and is used for outputting a stable VCC_GATE signal; And the other input end of the VCCx power supply module is electrically connected with the output end of the charge pump module and is used for responding to the VCC voltage, the first direct current voltage and the second direct current voltage and outputting a plurality of VCCx_GATE signals and VCCx' _GATE signals.
2. The high-precision split type multi-power rail power supply system for a digital-analog hybrid chip of claim 1, wherein the VCC power supply module comprises a first NMOS transistor and a first capacitor, wherein the grid electrode of the first NMOS transistor is electrically connected with the output end of the linear voltage stabilizing module, the drain electrode of the first NMOS transistor is electrically connected with an input voltage, the source electrode of the first NMOS transistor is electrically connected with a first node, the first end of the first capacitor is electrically connected with the first node, and the second end of the first capacitor is grounded; and when the first direct current voltage is greater than or equal to the threshold voltage of the first NMOS transistor, the first NMOS transistor is conducted to charge the first capacitor, so that the VCC voltage is formed.
3. The high-precision split multi-power rail power supply system for a digital-analog hybrid chip as set forth in claim 1, wherein said VCC power supply module further comprises a first clamp circuit and a second NMOS transistor, wherein, The first clamping circuit comprises a first PMOS transistor, a second PMOS transistor, a third NMOS transistor and a fourth NMOS transistor, wherein the grid electrode of the first PMOS transistor is electrically connected with the VCC voltage, the source electrode of the first PMOS transistor is electrically connected with the output end of the charge pump module, the drain electrode of the first PMOS transistor is electrically connected with a second node, the grid electrode of the third NMOS transistor is electrically connected with the second node, the drain electrode of the third NMOS transistor is electrically connected with the second node, the source electrode of the third NMOS transistor is electrically connected with the source electrode of the second PMOS transistor, the grid electrode of the second PMOS transistor is electrically connected with the first direct current voltage, the drain electrode of the second PMOS transistor is electrically connected with a third node, the grid electrode of the fourth NMOS transistor is electrically connected with the third node, the drain electrode of the fourth NMOS transistor is electrically connected with the third node, and the source electrode of the fourth NMOS transistor is grounded; When the VCC voltage is greater than or equal to a threshold voltage of the oscillator module, the oscillator module outputs the alternating signal, the charge pump module responds to the alternating signal and outputs the second direct current voltage which is twice as high as the VCC voltage, so that the first PMOS transistor, the second PMOS transistor, the third NMOS transistor and the fourth NMOS transistor are conducted, the first clamping circuit enters clamping to form a VCC_GATE signal, and the voltage of the VCC_GATE signal is greater than the first direct current voltage; The grid electrode of the second NMOS transistor is electrically connected with a VCC_GATE signal, the drain electrode of the second NMOS transistor is electrically connected with an input voltage, and the source electrode of the second NMOS transistor is electrically connected with a first node; when the voltage of the VCC_GATE signal is larger than or equal to the threshold voltage of the second NMOS transistor, the second NMOS transistor is turned on, and meanwhile, the first NMOS transistor is turned off, so that a stable VCC_GATE signal is formed.
4. The high-precision split multi-power rail power supply system for a digital-analog hybrid chip as recited in claim 1, wherein said VCC power supply module further comprises a fifth NMOS transistor, a second capacitor, and a first resistor, wherein, The grid electrode of the fifth NMOS transistor is electrically connected with the output end of the band gap reference module, the drain electrode of the fifth NMOS transistor is electrically connected with a fourth node, the source electrode of the fifth NMOS transistor is grounded, the first end of the second capacitor is electrically connected with the fourth node, the second end of the second capacitor is grounded, the first end of the first resistor is electrically connected with the fourth node, and the second end of the first resistor is electrically connected with the second node; the second capacitor and the first resistor form a low-pass filter to filter ripple waves of the charge pump module.
5. The digital-analog hybrid chip oriented high precision split multi-power rail power supply system of claim 1, wherein the VCC power supply module further comprises a third PMOS transistor, a gate of the third PMOS transistor is electrically connected to the first dc voltage, a source of the third PMOS transistor is electrically connected to a first node, and a drain of the third PMOS transistor is grounded; And when the VCC voltage suddenly rises, the third PMOS transistor is conducted to form a quick discharge path.
6. The high precision split multi-power rail power supply system for digital-analog hybrid chips as defined in claim 1, wherein the VCCx power supply module further comprises a second clamp circuit, a sixth NMOS transistor, a seventh NMOS transistor, a third capacitor, and a fourth capacitor, wherein, The second clamping circuit comprises a fourth PMOS transistor, a fifth PMOS transistor, an eighth NMOS transistor and a ninth NMOS transistor, wherein the grid electrode of the fourth PMOS transistor is electrically connected with the VCC voltage, the source electrode of the fourth PMOS transistor is electrically connected with the output end of the charge pump module, the drain electrode of the fourth PMOS transistor is electrically connected with a fifth node, the grid electrode of the eighth NMOS transistor is electrically connected with the fifth node, the drain electrode of the eighth NMOS transistor is electrically connected with the fifth node, the source electrode of the eighth NMOS transistor is electrically connected with the source electrode of the fifth PMOS transistor, the grid electrode of the fifth PMOS transistor is electrically connected with the first direct current voltage, the drain electrode of the fifth PMOS transistor is electrically connected with a sixth node, the grid electrode of the ninth NMOS transistor is electrically connected with the sixth node, the drain electrode of the ninth NMOS transistor is electrically connected with the sixth node, and the source electrode of the ninth NMOS transistor is grounded; When the VCC voltage is greater than or equal to a threshold voltage of the oscillator module, the oscillator module outputs the alternating signal, the charge pump module responds to the alternating signal and outputs the second direct current voltage which is twice as high as the VCC voltage, so that the fifth PMOS transistor, the eighth NMOS transistor and the ninth NMOS transistor are conducted, the second clamping circuit enters clamping to form a VCCx_GATE signal, and the voltage of the VCCx_GATE signal is greater than the first direct current voltage; The grid electrode of the seventh NMOS transistor is electrically connected with the VCCx_GATE signal, the drain electrode of the seventh NMOS transistor is electrically connected with an input voltage, the source electrode of the fourth NMOS transistor is electrically connected with a seventh node, the first end of the third capacitor is electrically connected with the seventh node, and the second end of the third capacitor is grounded; When the voltage of the VCCx_GATE signal is greater than or equal to the threshold voltage of the sixth NMOS transistor, the sixth NMOS transistor is conducted, the third capacitor is charged to form the voltage of VCCx, and when the voltage of the VCCx_GATE signal is greater than or equal to the threshold voltage of the seventh NMOS transistor, the seventh NMOS transistor is conducted, and the fourth capacitor is charged to form the voltage of VCCx-1.
7. The high precision split multi-power rail power supply system for digital-analog hybrid chips as defined in claim 1, wherein said VCCx power supply module further comprises a tenth NMOS transistor, a fifth capacitor, and a second resistor, wherein, The grid electrode of the tenth NMOS transistor is electrically connected with the output end of the band gap reference module, the drain electrode of the tenth NMOS transistor is electrically connected with a ninth node, the source electrode of the tenth NMOS transistor is grounded, the first end of the fifth capacitor is electrically connected with the ninth node, the second end of the fifth capacitor is grounded, the first end of the second resistor is electrically connected with the ninth node, and the second end of the second resistor is electrically connected with the fifth node; the fifth capacitor and the second resistor form a low-pass filter to filter ripple waves of the charge pump module.
8. The high precision split multi-power rail power supply system for digital-analog hybrid chips as defined in claim 1, wherein said VCCx power supply module further comprises a third clamp circuit, wherein, The third clamping circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth capacitor, a seventh capacitor, an eleventh NMOS transistor and a twelfth NMOS transistor, wherein the first end of the third resistor is electrically connected with the output end of the charge pump module, the second end of the third resistor is electrically connected with a tenth node, the first end of the fourth resistor is electrically connected with a tenth node, the second end of the fourth resistor is electrically connected with an eleventh node, the first end of the sixth capacitor is electrically connected with a tenth node, the second end of the sixth capacitor is electrically connected with a twelfth node, the first end of the seventh capacitor is electrically connected with a twelfth node, the second end of the seventh capacitor is grounded, the first end of the fifth resistor is electrically connected with a twelfth node, the second end of the fifth resistor is electrically connected with a VCCx-1 voltage, the gate of the eleventh NMOS transistor is electrically connected with an eleventh node, the drain of the eleventh NMOS transistor is electrically connected with the thirteenth node, the drain of the thirteenth transistor is connected with the twelfth node; When the VCC voltage is greater than or equal to the threshold voltage of the oscillator module, the oscillator module outputs the alternating signal, the charge pump module responds to the alternating signal and outputs the second direct current voltage which is twice as high as the VCC voltage, so that the eleventh NMOS transistor and the twelfth NMOS transistor are conducted, the third clamping circuit enters clamping, and a VCCx' _GATE signal is formed.
9. The high-precision split type multi-power rail power supply system for a digital-analog hybrid chip according to claim 1, wherein the VCCx power supply module further comprises a thirteenth NMOS transistor and an eighth capacitor, wherein a GATE of the thirteenth NMOS transistor is electrically connected to a VCCx' _gate signal, a drain of the thirteenth NMOS transistor is electrically connected to an input voltage, a source of the thirteenth NMOS transistor is electrically connected to a fourteenth node, a first end of the eighth capacitor is electrically connected to the fourteenth node, and a second end of the eighth capacitor is grounded; When the voltage of the VCCx' _gate signal is greater than or equal to the threshold voltage of the thirteenth NMOS transistor, the thirteenth NMOS transistor is turned on, and the eighth capacitor is charged to form a VCCx voltage.
10. The high precision split multi-power rail power supply system for a digital-analog hybrid chip as defined in claim 1, wherein the VCCx power supply module further comprises a sixth PMOS transistor, a seventh PMOS transistor, and an eighth PMOS transistor, wherein, The grid electrode of the sixth PMOS transistor is electrically connected with a first direct-current voltage, the source electrode of the sixth PMOS transistor is electrically connected with a seventh node, the drain electrode of the sixth PMOS transistor is grounded, the grid electrode of the seventh PMOS transistor is electrically connected with a first direct-current voltage, the source electrode of the seventh PMOS transistor is electrically connected with an eighth node, the drain electrode of the seventh PMOS transistor is grounded, the grid electrode of the eighth PMOS transistor is electrically connected with the first direct-current voltage, the source electrode of the eighth PMOS transistor is electrically connected with a fourteenth node, and the drain electrode of the eighth PMOS transistor is grounded; In the case that the VCCx voltage suddenly increases, the sixth PMOS transistor, the seventh PMOS transistor, and the eighth PMOS transistor are turned on, forming a rapid discharge path.

Description

High-precision separated type multi-power rail power supply system for digital-analog hybrid chip Technical Field The invention belongs to the technical field of microelectronics, and particularly relates to a high-precision separated multi-power-rail power supply system for a digital-analog hybrid chip. Background The on-chip power management circuit is a basic module of the digital-analog hybrid chip and is used for providing stable power supply voltage for each module in the chip so as to meet different requirements of power consumption of each module. With the continuous pursuit of performance by the digital-analog hybrid chip, the load current capability and the precision of the on-chip power management circuit also need to be continuously improved. The conventional on-chip power management circuit generally adopts a linear voltage stabilizer to directly supply power to an internal module, and a plurality of linear voltage stabilizers are required to be designed to supply power to a digital domain and an analog domain respectively. The linear voltage regulator needs to determine its bandwidth and stability according to different load requirements of the internal module, which causes inconvenience to design. Meanwhile, in order to meet the application scene of internal heavy load, the traditional scheme often adopts the scheme of an external patch capacitor to ensure the stability of a loop, and the scheme cost is higher. Therefore, it is desirable to provide an on-chip power management circuit for a digital-analog hybrid chip to improve the drawbacks of the prior art. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a high-precision separated multi-power rail power supply system for a digital-analog hybrid chip. The technical problems to be solved by the invention are realized by the following technical scheme: The invention provides a high-precision separated multi-power rail power supply system for a digital-analog hybrid chip, which comprises: The system comprises an enabling circuit module, wherein an input end of the enabling circuit module is electrically connected with a system power supply end and an external enabling command voltage end, and is used for outputting an enabling signal in response to the system power supply and the external enabling command voltage; the input end of the linear voltage stabilizing module is electrically connected with the output end of the enabling circuit module, and is used for outputting stable first direct-current voltage in response to the enabling signal; the input end of the VCC power supply module is electrically connected with the output end of the linear voltage stabilizing module, and responds to the first direct current voltage and is used for outputting VCC voltage; the input end of the band-gap reference module is electrically connected with the output end of the linear voltage stabilizing module, and responds to the first direct-current voltage and is used for outputting reference voltage; the oscillator module, an input end of the oscillator module is connected with output end of the reference band gap module electrically, and another input end of the oscillator module is connected with output end of VCC power supply module electrically, respond to reference voltage and VCC voltage, is used for outputting periodic alternating signal; The input end of the VCC power supply module is electrically connected with the output end of the charge pump module, and is used for outputting a stable VCC_GATE signal in response to the second direct current voltage; And one input end of the VCCx power supply module is electrically connected with the output end of the linear voltage stabilizing module, the other input end of the VCCx power supply module is electrically connected with the output end of the VCC power supply module, the other input end of the VCCx power supply module is electrically connected with the output end of the charge pump module, and the VCCx power supply module is used for outputting a plurality of VCCx_GATE signals and VCCx' _GATE signals in response to the VCC voltage, the first direct current voltage and the second direct current voltage. The invention has the beneficial effects that: The high-precision separated multi-power-supply-rail power supply system for the digital-analog hybrid chip comprises a circuit enabling module, a linear voltage stabilizing module, a band-gap reference module, an oscillator module, a charge pump module and a multi-power-rail output module, wherein voltage output of the multi-power-supply-rail is realized through single constant-voltage loop control, and the requirements of the digital-analog hybrid chip on different voltage domains are met. By reasonably designing the multi-power rail output module circuit, the invention has low requirements on the carrying capacity of the linear voltage stabilizing module and the charge pump module, so that the invention has hi