公开(公告)号：US09768741B2

公开(公告)日：2017-09-19

申请号：US14989911

申请日：2016-01-07

Applicant: AIROHA TECHNOLOGY CORP.

Inventor： Chun-Hsiung Chang

IPC: H03F1/02 ,  H03F1/56 ,  H03F3/21 ,  H03F1/32 ,  H03F3/19 ,  H03F1/14

CPC classification number: H03F1/565 ,  H03F1/14 ,  H03F3/19 ,  H03F3/21 ,  H03F2200/318 ,  H03F2200/451 ,  H03F2203/21139

Abstract: A method for improving circuit stability is disclosed. In the method of the present invention, the circuit is analyzed to find the frequency band in which the input impedance at a target node behaves as a negative resistance, and then find the signal path of the frequency band in the matching circuit in front of the target node and add an attenuator in the signal path. This prevents the circuit from oscillation and improves the stability of the circuit. Furthermore, the signal on the main signal path will not be attenuated and the performance of the circuit will be maintained.

公开(公告)号：US09966920B2

公开(公告)日：2018-05-08

申请号：US15413544

申请日：2017-01-24

Applicant: Airoha Technology Corp.

Inventor： Chun-Hsiung Chang

IPC: H03F3/04 ,  H03G3/30 ,  H03F3/19 ,  H03F3/21 ,  H03F1/02

CPC classification number: H03G3/3042 ,  H03F1/0216 ,  H03F3/19 ,  H03F3/21 ,  H03F2200/405 ,  H03F2200/451 ,  H03F2200/516

Abstract: A power amplifier circuit includes a power supply module and serially connected multi-stages of amplifier circuit. The multi-stages of amplifier circuit, coupled to the power supply module for amplifying an radio frequency (RF) input signal as an RF output signal, which include a driver stage of circuit and a gain stage of circuit. The driver stage of circuit receives and amplifies the RF input signal. The driver stage of circuit is powered by a first supply voltage received from the power supply module. The gain stage of circuit amplifies the signal received from previous stage of amplifier circuit and outputs the RF output signal. The gain stage of circuit is powered by a second supply voltage received from the power supply module. When the power amplifier circuit is operated in a back-off region, the first supply voltage is lower than the second supply voltage.

公开(公告)号：US20170214368A1

公开(公告)日：2017-07-27

申请号：US15413544

申请日：2017-01-24

Applicant: Airoha Technology Corp.

Inventor： Chun-Hsiung Chang

IPC: H03F1/02 ,  H03F3/21 ,  H03G3/30 ,  H03F3/19

CPC classification number: H03G3/3042 ,  H03F1/0216 ,  H03F3/19 ,  H03F3/21 ,  H03F2200/405 ,  H03F2200/451 ,  H03F2200/516

Abstract: A power amplifier circuit includes a power supply module and serially connected multi-stages of amplifier circuit. The multi-stages of amplifier circuit, coupled to the power supply module for amplifying an radio frequency (RF) input signal as an RF output signal, which include a driver stage of circuit and a gain stage of circuit. The driver stage of circuit receives and amplifies the RF input signal. The driver stage of circuit is powered by a first supply voltage received from the power supply module. The gain stage of circuit amplifies the signal received from previous stage of amplifier circuit and outputs the RF output signal. The gain stage of circuit is powered by a second supply voltage received from the power supply module. When the power amplifier circuit is operated in a back-off region, the first supply voltage is lower than the second supply voltage.