US 12,341,498 B2
Bidirectional signal conversion circuit
Leaf Chen, Hsinchu (TW); and Jiun-Hung Pan, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed on Feb. 14, 2023, as Appl. No. 18/109,470.
Prior Publication US 2023/0268913 A1, Aug. 24, 2023
Int. Cl. H03K 17/0412 (2006.01); H03K 17/693 (2006.01); H03K 19/0185 (2006.01)
CPC H03K 17/04123 (2013.01) [H03K 17/693 (2013.01); H03K 19/018592 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A bidirectional signal conversion circuit configured to perform a signal conversion between a first port and a second port, the bidirectional signal conversion circuit comprising:
a switch coupled between the first port and the second port, and configured to operate according to a bias, a voltage at the first port, and a voltage at the second port;
a first output-response enhancement circuit coupled between the first port and the second port, and configured to accelerate a transient response of an output port when the first port and the second port function as an input port and the output port respectively, the first output-response enhancement circuit including a first alternative-current (AC) coupling circuit and a first output-stage circuit, wherein:
the first AC coupling circuit is coupled between the first port and the first output-stage circuit, and configured to output a first control signal according to a variation in the voltage at the first port; and
the first output-stage circuit is coupled between the first AC coupling circuit and the second port, and configured to couple one of a second voltage terminal and a ground terminal with the second port according to the first control signal and thereby accelerate a variation in the voltage at the second port, wherein a voltage at the second voltage terminal is a second voltage; and
a second output-response enhancement circuit coupled between the second port and the first port, and configured to accelerate the transient response of the output port when the second port and the first port function as the input port and the output port respectively, the second output-response enhancement circuit including a second AC coupling circuit and a second output-stage circuit, wherein:
the second AC coupling circuit is coupled between the second port and the second output-stage circuit, and configured to output a second control signal according to the variation in the voltage at the second port; and
the second output-stage circuit is coupled between the second AC coupling circuit and the first port, and configured to couple one of a first voltage terminal and the ground terminal with the first port according to the second control signal and thereby accelerate the variation in the voltage at the first port, wherein a voltage at the first voltage terminal is a first voltage different from the second voltage,
the first AC coupling circuit includes:
a first amplifier circuit configured to output a first amplification signal according to the voltage at the first port; and
a first capacitor circuit configured to generate the first control signal according to the first amplification signal; and
the second AC coupling circuit includes:
a second amplifier circuit configured to output a second amplification signal according to the voltage at the second port; and
a second capacitor circuit configured to generate the second control signal according to the second amplification signal.