Charge-steering amplifier-based amplifier circuit
AssigneeRealtek Semiconductor Corp.
InventorShih-Hsiung Huang
Life of this patent
Estimating the term…
Abstract
An amplifier circuit, which has a first output terminal and a second output terminal, includes a first charge-steering amplifier, a second charge-steering amplifier, a first switch, and a second switch. The first charge-steering amplifier includes a first input terminal, a second input terminal, a first capacitor, and a second capacitor, and is used for amplifying a first input signal in a first operation period. The second charge-steering amplifier includes a third input terminal, a fourth input terminal, the first capacitor, and the second capacitor, and is used for amplifying a second input signal in a second operation period. The first capacitor and the second capacitor charge during the first operation period and discharge during the second operation period.
Claims20
An amplifier circuit having a first output terminal and a second output terminal, comprising:
- a first charge-steering amplifier comprising a first input terminal, a second input terminal, a first capacitor, and a second capacitor and configured to amplify a first input signal during a first operation period;
- a second charge-steering amplifier comprising a third input terminal, a fourth input terminal, the first capacitor, and the second capacitor and configured to amplify a second input signal during a second operation period;
- a first switch coupled between the first output terminal and a first target voltage or a second target voltage;
- and
- a second switch coupled between the second output terminal and the first target voltage or the second target voltage;
- wherein the first capacitor is coupled between the first output terminal and a reference voltage, the second capacitor is coupled between the second output terminal and the reference voltage, the first capacitor and the second capacitor charge during the first operation period, and the first capacitor and the second capacitor discharge during the second operation period.
A charge-steering amplifier circuit having a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal, and a second output terminal, comprising:
- a first transistor having a first terminal, a second terminal, and a first control terminal, wherein the first control terminal is electrically connected to the first input terminal, and the second terminal is electrically connected to the first output terminal;
- a second transistor having a third terminal, a fourth terminal, and a second control terminal, wherein the second control terminal is electrically connected to the second input terminal, the fourth terminal is electrically connected to the second output terminal, and the third terminal is electrically connected to the first terminal;
- a third transistor having a fifth terminal, a sixth terminal, and a third control terminal, wherein the third control terminal is electrically connected to the third input terminal, and the sixth terminal is electrically connected to the first output terminal;
- a fourth transistor having a seventh terminal, an eighth terminal, and a fourth control terminal, wherein the fourth control terminal is electrically connected to the fourth input terminal, the eighth terminal is electrically connected to the second output terminal, and the seventh terminal is electrically connected to the fifth terminal;
- a first capacitor coupled between the first terminal and a reference voltage;
- a second capacitor coupled between the fifth terminal and the reference voltage;
- a third capacitor coupled between the first output terminal and the reference voltage;
- a fourth capacitor coupled between the second output terminal and the reference voltage;
- a first switch coupled between the first capacitor and the first terminal;
- a second switch coupled to the first capacitor, wherein the first capacitor discharges when the second switch is turned on;
- a third switch coupled between the second capacitor and the fifth terminal;
- a fourth switch coupled to the second capacitor, wherein the second capacitor charges when the fourth switch is turned on;
- a fifth switch configured to couple the first output terminal to a first target voltage or a second target voltage;
- and
- a sixth switch configured to couple the second output terminal to the first target voltage or the second target voltage.
Dependencies are inferred from the claim text.