公开(公告)号：US20190253029A1

公开(公告)日：2019-08-15

申请号：US16394037

申请日：2019-04-25

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： De-Shiou TSENG ,  Wei-Ta CHIU

IPC: H03F3/45 ,  H03F1/02 ,  H03K17/22 ,  H03F3/30 ,  G05F1/56

CPC classification number: H03F3/45654 ,  G05F1/561 ,  H03F1/0222 ,  H03F1/025 ,  H03F3/3022 ,  H03F3/45179 ,  H03F3/45475 ,  H03F3/45708 ,  H03F3/45713 ,  H03F2200/511 ,  H03F2200/516 ,  H03K17/223 ,  H03K2217/0081

Abstract: A driver circuit includes a first operational amplifier circuit, a second operational amplifier circuit, and at least one power switching circuit is provided. The first operational amplifier circuit receives a first input signal and generates a first output signal according to the first input signal. The second operational amplifier circuit receives a second input signal and generates a second output signal according to the second input signal. The at least one power switching circuit is coupled to the first operational amplifier circuit and the second operational amplifier circuit, and configured to switch at least one power supply for both the first operational amplifier circuit and the second operational amplifier circuit.

公开(公告)号：US20200373893A1

公开(公告)日：2020-11-26

申请号：US16421538

申请日：2019-05-24

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： De-Shiou TSENG

IPC: H03F3/45 ,  H03G3/30 ,  H03G1/00

Abstract: An output stage circuit of an operational amplifier, the operational amplifier, and a signal amplifying method applied to the operational amplifier are provided. The output stage circuit includes an inverting circuit and a compensation module. The inverting circuit is electrically connected to a gain stage circuit of the operational amplifier. The inverting circuit generates an output signal of the operational amplifier. The compensation module includes a first compensation circuit, including a first current providing path and a first suppression activation circuit. The first current providing path provides a first compensation current. The first suppression activation circuit conducts the first compensation current to the inverting circuit if a first compensation condition related to a first gain stage signal generated by the gain stage circuit is satisfied. Variation of the output signal is suppressed because of the first compensation current.

公开(公告)号：US20180294785A1

公开(公告)日：2018-10-11

申请号：US15854046

申请日：2017-12-26

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： De-Shiou TSENG ,  Wei-Ta CHIU

IPC: H03F3/45 ,  G05F1/56 ,  H03K17/22

CPC classification number: H03F3/45654 ,  G05F1/561 ,  H03F1/0222 ,  H03F1/025 ,  H03F3/3022 ,  H03F3/45179 ,  H03F3/45475 ,  H03F3/45708 ,  H03F3/45713 ,  H03F2200/511 ,  H03F2200/516 ,  H03K17/223 ,  H03K2217/0081

Abstract: A driver circuit including a first op-amp, a second op-amp, and a power switching circuit is provided. The first op-amp includes a first input stage circuit for generating a first amplified signal and a first output stage circuit. The second op-amp includes a second input stage circuit for generating a second amplified signal and a second output stage circuit. The power switching circuit includes a first output terminal for outputting one of the first amplified signal and the second amplified signal and a second output terminal for outputting the other of the first amplified signal and the second amplified signal. The power switching circuit is configured to switch a first power supply for both the first input stage circuit and the second input stage circuit between a first supply voltage and a second supply voltage in response to the control signal.