US 11,693,474 B2
Circuitry applied to multiple power domains
Wei-Cheng Tang, HsinChu (TW); Li-Lung Kao, HsinChu (TW); Chia-Ling Chang, HsinChu (TW); Sheng-Wei Lin, HsinChu (TW); and Sheng-Tsung Wang, HsinChu (TW)
Assigned to Realtek Semiconductor Corp., HsinChu (TW)
Filed by Realtek Semiconductor Corp., HsinChu (TW)
Filed on May 25, 2021, as Appl. No. 17/329,164.
Claims priority of application No. 109124504 (TW), filed on Jul. 21, 2020.
Prior Publication US 2022/0026979 A1, Jan. 27, 2022
Int. Cl. G06F 1/3296 (2019.01); G06F 1/3234 (2019.01)
CPC G06F 1/3296 (2013.01) [G06F 1/3243 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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.