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US 12,537,490 B2Granted
Amplifier and method for controlling common mode voltage of the same
AssigneeRealtek Semiconductor Corp.
InventorsShih-Hsiung Huang, Wei-Cian Hong
Life of this patent
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Abstract
The present application discloses an amplifier and a method for controlling a common mode voltage thereof. The method includes: generating a control signal according to a positive-terminal input signal, a negative-terminal input signal and a target common mode voltage; and coupling the controlling signal to a first terminal of a positive-terminal capacitor and a first terminal of a negative-terminal capacitor, to adjust degree of conduction of a positive-terminal p-type transistor and degree of conduction of a negative-terminal p-type transistor, or to adjust degree of conduction of a positive-terminal n-type transistor and degree of conduction of a negative-terminal n-type transistor, thereby changing a common mode voltage.
Claims20
An amplifier, comprising:
- a positive-terminal p-type transistor;
- a negative-terminal p-type transistor;
- a positive-terminal n-type transistor, wherein the positive-terminal p-type transistor and the positive-terminal n-type transistor are stacked between a first reference voltage and a second reference voltage, a drain of the positive-terminal n-type transistor is coupled to a drain of the positive-terminal p-type transistor and outputs a positive-terminal output signal;
- a negative-terminal n-type transistor, wherein the negative-terminal p-type transistor and the negative-terminal n-type transistor are stacked between the first reference voltage and the second reference voltage, and a drain of the negative-terminal n-type transistor is coupled to a drain of the negative-terminal p-type transistor and outputs a negative-terminal output signal;
- a first positive-terminal capacitor, coupled between a gate of the positive-terminal p-type transistor and a gate of the positive-terminal n-type transistor;
- a first negative-terminal capacitor, coupled between a gate of the negative-terminal p-type transistor and a gate of the negative-terminal n-type transistor;
- and
- a first control circuit, configured to generate a first control signal to a first terminal of the first positive-terminal capacitor and a first terminal of the first negative-terminal capacitor according to the positive-terminal output signal, the negative-terminal output signal and a target common mode voltage,
- wherein a positive-terminal input signal of the amplifier is input from a second terminal of the first positive-terminal capacitor, and a negative-terminal input signal of the amplifier is input from a second terminal of the first negative-terminal capacitor.
6 more elements
A method for controlling a common mode voltage of an amplifier, wherein the amplifier comprises:
- a positive-terminal p-type transistor;
- a negative-terminal p-type transistor;
- a positive-terminal n-type transistor, wherein the positive-terminal p-type transistor and the positive-terminal n-type transistor are stacked between a first reference voltage and a second reference voltage, a drain of the positive-terminal n-type transistor is coupled to a drain of the positive-terminal p-type transistor and outputs a positive-terminal output signal;
- a negative-terminal n-type transistor, wherein the negative-terminal p-type transistor and the negative-terminal n-type transistor are stacked between the first reference voltage and the second reference voltage, and a drain of the negative-terminal n-type transistor is coupled to a drain of the negative-terminal p-type transistor and outputs a negative-terminal output signal;
- a first positive-terminal capacitor, coupled between a gate of the positive-terminal p-type transistor and a gate of the positive-terminal n-type transistor;
- a first negative-terminal capacitor, coupled between a gate of the negative-terminal p-type transistor and a gate of the negative-terminal n-type transistor;
- and
- wherein a positive-terminal input signal of the amplifier is input from a second terminal of the first positive-terminal capacitor, and a negative-terminal input signal of the amplifier is input from a second terminal of the first negative-terminal capacitor;
- and
- the method comprises:
- generating a first control signal according to according to the positive-terminal output signal, the negative-terminal output signal and a target common mode voltage;
- and
- coupling the controlling signal to a first terminal of the first positive-terminal capacitor and a first terminal of the first negative-terminal capacitor, so as to adjust degree of conduction of the positive-terminal p-type transistor and degree of conduction of the negative-terminal p-type transistor, or to adjust degree of conduction of the positive-terminal n-type transistor and degree of conduction of the negative-terminal n-type transistor, thereby changing a common mode voltage of the positive-terminal output signal and the negative-terminal output signal.
10 more elements
Dependencies are inferred from the claim text.