Circuitry applied to multiple power domains
AssigneeRealtek Semiconductor Corp.
InventorsWei-Cheng Tang, Li-Lung Kao, Chia-Ling Chang, Sheng-Wei Lin, Sheng-Tsung Wang
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Abstract
The present invention provides a circuitry applied to multiple power domains. An amplifier of the circuitry includes an output stage and a switching circuit. The output stage includes a first transistor and a second transistor, wherein the first transistor is coupled between a supply voltage and an output terminal, the second transistor is coupled between the output terminal and a ground voltage. The switching circuit is configured to choose a body of the first transistor from the supply voltage or a reference voltage.
Claims14
A circuitry applied to multiple power domains, comprising:
- a first amplifier, configured to receive an input signal and generate a processed input signal, wherein the first amplifier is supplied by a first supply voltage of a first power domain;
- and
- a second amplifier, coupled to the first amplifier, configured to receive the processed input signal and generate an output signal, wherein the second amplifier is supplied by a second supply voltage of a second power domain;
- wherein the second amplifier comprises:
- an output stage comprising a first transistor and a second transistor, wherein the first transistor is coupled between the second supply voltage and an out put terminal, the second transistor is coupled between the output terminal and a ground voltage;
- and
- a switching circuit, configured to selectively connect a body of the first transistor to the second supply voltage or a reference voltage;
- and
- a detection circuit, configured to generate a detection result indicating whether the second supply voltage supplied to the second amplifier exists or not;
- wherein the switching circuit selectively connects the body of the first transistor to the second supply voltage or the reference voltage according to the detection result.
A circuitry, comprising:
- an amplifier, comprising:
- an output stage comprising a first transistor and a second transistor, wherein the first transistor is coupled between a supply voltage and an output terminal, the second transistor is coupled between the output terminal and a ground voltage;
- and
- a switching circuit, configured to selectively connect a body of the first transistor to the supply voltage or a reference voltage;
- wherein the switching circuit selectively connects the body of the first transistor to the supply voltage or the reference voltage according to a detection result, wherein the detection result indicates if the supply voltage supplied to the amplifier exists or not.
A circuitry applied to multiple power domains, comprising:
- a first amplifier, configured to receive an input signal to generate a processed input signal, wherein the first amplifier is supplied by a first supply voltage of a first power domain;
- and
- a second amplifier, coupled to the first amplifier, configured to receive the processed input signal to generate an output signal, wherein the second amplifier is supplied by a second supply voltage of a second power domain;
- wherein the first amplifier comprises:
- an output stage comprising a first transistor and a second transistor, wherein the first transistor is coupled between the first supply voltage and an output terminal, the second transistor is coupled between the output terminal and a ground voltage;
- and
- a switching circuit, configured to selectively connect a body of the first transistor to the first supply voltage or a reference voltage;
- and
- a detection circuit, configured to determine if the first supply voltage supplied to the first amplifier exists to generate a detection result;
- wherein the switching circuit selectively connects the body of the first transistor to the second supply voltage or the reference voltage according to the detection result.
Dependencies are inferred from the claim text.