CN-122026819-A - Amplifier and method of operating the same

Abstract

An amplifier includes a signal input terminal, a signal output terminal, an amplifying circuit, and at least one variable voltage generating circuit. The signal input terminal is used for receiving an input signal. The signal output terminal is used for outputting an amplified signal. The transistor of the amplifying circuit comprises a first end, a second end, a control end and a substrate end, wherein the control end is coupled with the signal input end, the second end is coupled with the signal output end, and the connection state of the substrate end is a floating state. The at least one variable voltage generation circuit is coupled to the transistor of the amplifying circuit. During transients there is a first voltage difference between the second and first terminals of the transistor and during steady state there is a second voltage difference. The first voltage difference is greater than the second voltage difference.

Inventors

• PENG TIANYUN
• CHEN ZHISHENG

Assignees

• 立积电子股份有限公司

Dates

Publication Date

20260512

Application Date

20241122

Priority Date

20241111

Claims (20)

1. 1. An amplifier is provided, which comprises a first amplifier and a second amplifier, characterized by comprising the following steps: a signal input end for receiving an input signal; A signal output end for outputting an amplified signal; An amplifying circuit coupled between the signal input end and the signal output end, the amplifying circuit including a first transistor including a first end, a second end, a control end and a substrate end, wherein the first end is coupled to a first node, the second end is coupled to a second node, the control end is coupled to the signal input end, the substrate end is in a floating state, and At least one variable voltage generating circuit coupled to the amplifying circuit; Wherein: during an transient state, the at least one variable voltage generation circuit provides a first voltage difference between the second terminal and the first terminal of the first transistor; During a steady state, the at least one variable voltage generating circuit provides a second voltage difference between the second end and the first end of the first transistor The first voltage difference is greater than the second voltage difference.
2. 2. The amplifier of claim 1, wherein the amplifying circuit further comprises: The second transistor comprises a first end, a second end and a control end, wherein the first end is coupled to the second node, the second end is coupled to the signal output end, and the control end is coupled to a third node.
3. 3. An amplifier according to claim 2, characterized in that, The at least one variable voltage generating circuit comprises a first variable voltage generating circuit coupled to the third node and configured to provide a first pulse voltage signal at the third node; the first pulse voltage signal has a first potential during the transient period During the steady state, the first pulse voltage signal has a second potential.
4. 4. An amplifier according to claim 3, characterized in that, During the transient state, a voltage level of the second end of the first transistor is determined by the first level of the first pulse voltage signal; During the steady state, the voltage level of the second end of the first transistor is determined by the second level of the first pulse voltage signal, and During the transient state and the steady state, a voltage potential of the first end of the first transistor is maintained substantially unchanged.
5. 5. The amplifier of claim 3, wherein the first potential is different from the second potential.
6. 6. The amplifier of claim 2, wherein the second transistor further comprises a substrate end, and a connection state of the substrate end of the second transistor is a floating state or a contact state.
7. 7. An amplifier according to claim 2, characterized in that, The second end of the second transistor is also coupled to an operating voltage end; during the transient state, the operating voltage terminal provides a first operating voltage; During the steady state, the operating voltage terminal provides a second operating voltage The first operating voltage is higher than the second operating voltage.
8. 8. An amplifier according to claim 2, characterized in that, The at least one variable voltage generating circuit comprises a second variable voltage generating circuit coupled to the second node and configured to provide a second pulse voltage signal at the second node; the second pulse voltage signal has a third potential during the transient period During the steady state, the second pulse voltage signal has a fourth potential.
9. 9. The amplifier of claim 8, wherein the third potential is higher than the fourth potential.
10. 10. The amplifier of claim 8, wherein the amplifier is configured to, The second variable voltage generating circuit comprises a first switch, wherein the first switch comprises a first end, a second end and a control end, the first end is coupled with a first reference voltage end, the second end is coupled with the second node, and the control end is used for receiving a first control signal; the first switch is turned on according to the first control signal during the transient state so that the second node receives the first reference voltage, and turned off according to the first control signal during the steady state.
11. 11. An amplifier according to claim 2, characterized in that, The at least one variable voltage generating circuit comprises a third variable voltage generating circuit coupled to the first node and configured to provide a third pulse voltage signal at the first node; The third pulse voltage signal has a fifth potential during the transient period During the steady state, the third pulse voltage signal has a sixth potential.
12. 12. The amplifier of claim 11, wherein the fifth potential is lower than the sixth potential.
13. 13. The amplifier of claim 11, wherein the amplifier is configured to, The third variable voltage generating circuit comprises a second switch, wherein the second switch comprises a first end, a second end and a control end, the first end is coupled to the first node, the second end is coupled to a second reference voltage end, and the control end is used for receiving a second control signal.
14. 14. The amplifier of claim 13, wherein the amplifier is configured to, The third variable voltage generating circuit comprises a third switch, the third switch comprises a first end, a second end and a control end, wherein the first end is coupled with the first node, the second end is coupled with a third reference voltage end, and the control end is used for receiving a third control signal; a voltage potential of the second reference voltage terminal is lower than a voltage potential of the third reference voltage terminal; During the transient period, the second switch is turned on according to the second control signal and the third switch is turned off according to the third control signal, so that the first node receives a voltage of the second reference voltage terminal During the steady state, the second switch is turned off according to the second control signal, and the third switch is turned on according to the third control signal, so that the first node receives a voltage of the third reference voltage.
15. 15. The amplifier of claim 1 wherein a duration of the transient period is substantially between 360 ns and 440 ns.
16. 16. The amplifier of claim 1, wherein the amplifier is configured to, During the transient state, a current flowing through the first transistor is substantially unstable, and During the steady state, the current flowing through the first transistor is substantially stable.
17. 17. A method of operation for an amplifier, characterized in that, The amplifier includes: a signal input end for receiving an input signal; A signal output end for outputting an amplified signal; An amplifying circuit coupled between the signal input end and the signal output end, the amplifying circuit including a first transistor including a first end, a second end, a control end and a substrate end, wherein the first end is coupled to a first node, the second end is coupled to a second node, the control end is coupled to the signal input end, the substrate end is in a floating state, and At least one variable voltage generating circuit coupled to the amplifying circuit; The operation method comprises the following steps: During an transient state, the at least one variable voltage generating circuit provides a first voltage difference between the second terminal and the first terminal of the first transistor, and During a steady state, the at least one variable voltage generating circuit provides a second voltage difference between the second end and the first end of the first transistor The first voltage difference is greater than the second voltage difference.
18. 18. The method of operation of claim 17, wherein, The amplifying circuit further includes: The second transistor comprises a first end, a second end and a control end, wherein the first end is coupled to the second node, the second end is coupled to the signal output end, and the control end is coupled to a third node; The at least one variable voltage generating circuit comprises a first variable voltage generating circuit coupled to the third node The method of operation further comprises: The first variable voltage generating circuit provides a first pulse voltage signal at the third node; Wherein: the first pulse voltage signal has a first potential during the transient period During the steady state, the first pulse voltage signal has a second potential.
19. 19. The method of operation of claim 17, wherein, The at least one variable voltage generating circuit comprises a second variable voltage generating circuit coupled to the second node The method of operation further comprises: the second variable voltage generating circuit provides a second pulse voltage signal at the second node; Wherein: the second pulse voltage signal has a third potential during the transient period During the steady state, the second pulse voltage signal has a fourth potential.
20. 20. The method of operation of claim 17, wherein, The at least one variable voltage generating circuit comprises a third variable voltage generating circuit coupled to the first node The method of operation further comprises: the third variable voltage generating circuit provides a third pulse voltage signal at the first node; Wherein: The third pulse voltage signal has a fifth potential during the transient period During the steady state, the third pulse voltage signal has a sixth potential.

Description

Amplifier and method of operating the same Technical Field The present disclosure relates to an amplifier and a method for operating the same, and more particularly, to an amplifier capable of rapidly entering a steady state from a transient state (transient) and a method for operating the same. Background An amplifier is an important element of a radio frequency transceiver circuit, which can be used to amplify radio frequency signals. For example, the amplifiers may include a Power Amplifier (PA), a low noise amplifier (LNA, low Noise Amplifier), and the like. In a communication system, an amplifier may be placed near an antenna for amplifying a received signal. The performance of the amplifier may be evaluated by a number of parameters, such as gain, noise figure, linearity, energy loss, stability, etc. When designing an amplifier, for example for a good noise figure, floating body transistors may be used, wherein the substrate terminals of the transistors are floating. In practice, the amplifier may switch between operating states. The threshold voltage (threshold voltage) of the transistor with the substrate in the floating state may be less likely to stabilize during the operating state transition, thus resulting in less likely to stabilize the current (e.g., drain-source current) of the transistor, resulting in slower transient response of the amplifier. According to observation, if the voltage difference between the drain electrode and the source electrode of the transistor is increased, the transistor can be stabilized quickly, so that the drain-source current can be stabilized quickly, and the transient response of the amplifier is improved. There is therefore a need for an amplifier architecture that can quickly switch between different modes of operation and that can compromise performance parameters such as noise figure. Disclosure of Invention An embodiment provides an amplifier, which comprises a signal input end, a signal output end, an amplifying circuit and at least one variable voltage generating circuit. The signal input terminal is used for receiving an input signal. The signal output end is used for outputting an amplified signal. The amplifying circuit is coupled between the signal input end and the signal output end, and comprises a first transistor, wherein the first transistor comprises a first end, a second end, a control end and a substrate end, the first end is coupled with a first node, the second end is coupled with a second node, the control end is coupled with the signal input end, and a connection state of the substrate end is a floating state. The at least one variable voltage generating circuit is coupled to the amplifying circuit. During an transient state, the at least one variable voltage generation circuit provides a first voltage difference between the second terminal and the first terminal of the first transistor. During a steady state, the at least one variable voltage generation circuit provides a second voltage difference between the second terminal and the first terminal of the first transistor. The first voltage difference is greater than the second voltage difference. Another embodiment provides a method of operation for an amplifier. The amplifier includes a signal input terminal, a signal output terminal, an amplifying circuit, and at least one variable voltage generating circuit. The signal input terminal is used for receiving an input signal. The signal output end is used for outputting an amplified signal. The amplifying circuit is coupled between the signal input end and the signal output end, and comprises a first transistor, wherein the first transistor comprises a first end, a second end, a control end and a substrate end, the first end is coupled with a first node, the second end is coupled with a second node, the control end is coupled with the signal input end, and a connection state of the substrate end is a floating state. The at least one variable voltage generating circuit is coupled to the amplifying circuit. The operating method includes providing a first voltage difference between the second terminal and the first terminal of the first transistor by the at least one variable voltage generating circuit during an transient state, and providing a second voltage difference between the second terminal and the first terminal of the first transistor by the at least one variable voltage generating circuit during a steady state. The first voltage difference is greater than the second voltage difference. Drawings Fig. 1 is a schematic diagram of an amplifier according to an embodiment of the present disclosure. Fig. 2 is a schematic diagram of another amplifier according to an embodiment of the present disclosure. Fig. 3 to 4 are schematic diagrams illustrating voltage potentials of partial nodes of an amplifier according to an embodiment of the present invention. Fig. 5 is a schematic diagram of yet another amplifier according to an embodiment of the