CN-224233651-U - Low-power consumption RC oscillator

Abstract

The utility model discloses a low-power-consumption RC oscillator which comprises a starting circuit, a current source circuit and a core oscillating circuit. The starting circuit is responsible for enabling the whole circuit to successfully reach a designed working point and be turned off after starting, the current source circuit is responsible for generating a PTAT current, and the core oscillating circuit is responsible for generating square wave oscillation. The utility model adopts an AVDD/AVSS dual-power supply architecture and a multi-path current mirror structure, ensures the stability of the oscillation frequency, effectively solves the technical bottlenecks of starting delay, temperature drift, power consumption efficiency tradeoff and the like of the traditional RC oscillator through the collaborative optimization design of the core oscillation circuit and the buffer output stage, and provides a novel solution for the power management module of the miniaturized electronic system.

Inventors

• CAI CHAOBO
• LU SHUANGJIANG
• SONG SHUXIANG
• QIN YUXIN
• FAN CHENYING
• CEN MINGCAN
• TANG XIAOHU

Assignees

• 广西师范大学

Dates

Publication Date

20260512

Application Date

20250530

Claims (1)

1. 1. The utility model provides a low-power consumption RC oscillator, includes starting circuit, current source circuit and core oscillating circuit, its characterized in that: The starting circuit comprises PMOS tubes M0 and M1, NMOS tubes M2, M3, M4, M5, M6 and M7, wherein the sources of M0 and M1 are connected to a power supply VDD end, the grid electrode of M0 is connected to a node VBP, the drain electrode of M0 is connected with the drain electrode of M2, the source electrode of M2 is connected with the drain electrode of M3, the source electrode of M3 is connected with the drain electrode of M4, the source electrode of M4 is connected with the drain electrode of M5, the source electrode of M5 is connected with the drain electrode of M6, the source electrodes of M7 are connected with the drain electrodes of M2, M5, M6 and M7, the grid electrode of M1 is connected to a node of VStartup _off, and the drain electrode of M1 is connected to a node of VStart _up; The current source circuit comprises PMOS tubes M10 and M11, NMOS tubes M8 and M9 and a resistor R0, wherein the sources of the M10 and M11 are connected to a power supply voltage VDD, the gates of the M10 and M11, the drains of the M8 and M10 are connected to a node VBP, the drains of the M9 and M11, the gates of the M8 and M9 are connected to a node VStart _up, the source of the M9 is connected to a power supply VSS end, the source of the M8 is connected with one end of a resistor R0, and the other end of the resistor R0 is connected with the power supply VSS end; The core oscillating circuit comprises PMOS tubes M12 and M13, NMOS tubes M15, M16 and M17, a capacitor C0, a Schmitt trigger I0 and an inverter I1, sources of the M12 and M13 are connected to a power supply VDD end, grids of the M12 and M13 are connected to a node VBP, drains of the M12 and M15 are connected, sources of the M15, drains of the M17, grids of the M17 and M16 are connected with each other, sources of the M16 and M17 are connected to a power supply VSS end, drains of the M13 and M16, one end of the capacitor C0 and an input end of the Schmitt trigger I0 are connected with each other, an output end of the Schmitt trigger I0 is connected with an input end of the inverter I1, and the other end of the capacitor C0 and the grid of the M15 are connected to an output end of the inverter I1 and serve as an output port of an RC oscillator.

Description

Low-power consumption RC oscillator Technical Field The utility model belongs to the technical field of integrated circuits, and particularly relates to an ultralow power consumption oscillator circuit based on a dual-power architecture. Background In view of the urgent demands of front-edge applications such as terminals of the Internet of things, biomedical implantation equipment, miniaturized wireless sensing nodes and the like on ultra-low power consumption clock sources, the current mainstream RC oscillators generally face sharp contradictions between static current and frequency stability of subthreshold working areas. Under the traditional single power architecture, the subthreshold leakage current of a transistor is generally more than 5 mu A, so that the nA-level power consumption requirement of a button battery power supply scene is difficult to meet, and the deep cut-off bias strategy is adopted to cause the problems of obvious start delay (more than 10 ms), temperature drift (more than 5000ppm/° C) and the like. Disclosure of utility model The utility model provides a low-power-consumption RC oscillator, which greatly reduces power consumption and starting delay by utilizing a multi-current mirror design. The temperature coefficient of the oscillator is 2322ppm/°c in the range of-40 ℃ to 125 ℃ and the total output noise is 2.57mV. The utility model has the characteristics of low power consumption, low noise and low time delay, and can be applied to button cell power supply circuits. The low-power consumption RC oscillator provided by the utility model comprises a starting circuit, a current source circuit and a core oscillating circuit. The starting circuit is responsible for enabling the whole circuit to successfully reach a designed working point and be turned off after starting, the current source circuit is responsible for generating a PTAT current, and the core oscillating circuit is responsible for generating square wave oscillation. The starting circuit comprises PMOS tubes M0 and M1, NMOS tubes M2, M3, M4, M5, M6 and M7, wherein sources of the NMOS tubes M2, M3, M4, M5, M6 and M7 are connected to a power supply VDD end, a grid electrode of the M0 is connected to a node VBP, a drain electrode of the M0 is connected to a drain electrode of the M2, a source electrode of the M2 is connected to a drain electrode of the M3, a source electrode of the M3 is connected to a drain electrode of the M4, a source electrode of the M4 is connected to a drain electrode of the M5, a source electrode of the M5 is connected to a drain electrode of the M6, a grid electrode of the M2, M3, M4, M5, M6 and M7 are connected to a node of the reference numeral VStartup _off, and a drain electrode of the M1 is connected to a node of the reference numeral VStart _up. The current source circuit comprises PMOS tubes M10 and M11, NMOS tubes M8 and M9 and a resistor R0, wherein the sources of the M10 and M11 are connected to a power supply voltage VDD, the gates of the M10 and M11, the drains of the M8 and M10 are connected to a node VBP, the drains of the M9 and M11, the gates of the M8 and M9 are connected to a node VStart _up, the source of the M9 is connected to a power supply VSS end, the source of the M8 is connected with one end of a resistor R0, and the other end of the resistor R0 is connected with the power supply VSS end. The core oscillating circuit comprises PMOS tubes M12 and M13, NMOS tubes M15, M16 and M17, a capacitor C0, a Schmitt trigger I0 and an inverter I1, sources of the M12 and M13 are connected to a power supply VDD end, grids of the M12 and M13 are connected to a node VBP, drains of the M12 and M15 are connected, sources of the M15, drains of the M17, grids of the M17 and M16 are connected with each other, sources of the M16 and M17 are connected to a power supply VSS end, drains of the M13 and M16, one end of the capacitor C0 and an input end of the Schmitt trigger I0 are connected with each other, an output end of the Schmitt trigger I0 is connected with an input end of the inverter I1, and the other end of the capacitor C0 and the grid of the M15 are connected to an output end of the inverter I1 and serve as an output port of an RC oscillator. The tail end of the Schmitt trigger can be connected with a resistor to prevent latch-up effect when the schmitt trigger is suddenly opened. The utility model has the technical characteristics and effects that: The Widlar current source module, the Schmidt trigger shaping circuit and the self-adaptive starting control unit are innovatively integrated, and low power consumption is realized by combining with a MOS tube configuration strategy of a constant current working area. Particularly, an AVDD/AVSS dual-power supply structure and a multi-path current mirror structure are adopted, the technical bottlenecks of starting delay, temperature drift, power consumption efficiency tradeoff and the like existing in a traditional RC oscillator are effectively so