US 12,088,261 B2
Non-linear feedback circuit and low-noise amplifier using the same
Jiaying Song, Jiangsu (CN); and Yifan Jiang, Jiangsu (CN)
Assigned to NanJing Milliway Microelectronics Technology Co., LTD., Nanjing (CN)
Appl. No. 17/296,457
Filed by NanJing Milliway Microelectronics Technology Co., LTD., Jiangsu (CN)
PCT Filed Oct. 22, 2019, PCT No. PCT/CN2019/112620
§ 371(c)(1), (2) Date May 24, 2021,
PCT Pub. No. WO2020/134417, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811601417.8 (CN), filed on Dec. 26, 2018.
Prior Publication US 2021/0399696 A1, Dec. 23, 2021
Int. Cl. H03F 1/30 (2006.01); H03F 1/32 (2006.01); H03F 3/21 (2006.01)
CPC H03F 3/21 (2013.01) [H03F 1/30 (2013.01); H03F 1/3247 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A nonlinear feedback circuit, comprising a second resistor R2, a first capacitor C1, a second capacitor C2 and at least one diode;
wherein when there is only one diode, a cathode of the diode is configured to connect to a gate of an enhancement-mode pseudomorphic high electron mobility transistor (pHemt) Q1 in a low noise amplifier, and an anode of the diode is configured to connect to a drain of the enhancement-mode pHemt Q1 in the low noise amplifier; the second resistor R2 is connected in series with the diode to form a first series circuit, one end of the first series circuit consisting of the second resistor R2 and the diode is configured to connect to the drain of the enhancement-mode pHemt Q1 in the low noise amplifier, and the other end of the first series circuit consisting of the second resistor R2 and the diode is configured to connect to the gate of the enhancement-mode pHemt Q1 in the low noise amplifier; and one end of the first capacitor C1 is configured to connect to the anode of the diode, and one end of the second capacitor C2 is configured to connect to the cathode of the diode;
and when there are two or more diodes, all the diodes are connected in series, wherein an anode of a first diode is configured to connect to the drain of the enhancement-mode pHemt Q1 in the low noise amplifier, a cathode of the first diode is configured to connect to an anode of a second diode, and a cathode of a last diode is configured to connect to the gate of the enhancement-mode pHemt Q1 in the low noise amplifier; the second resistor R2 is connected in series with all the diodes to form a second series circuit, one end of the second series circuit consisting of the second resistor R2 and all the diodes is configured to connect to the drain of the enhancement-mode pHemt Q1 in the low noise amplifier, and the other end of the second series circuit consisting of the second resistor R2 and all the diodes is configured to connect to the gate of the enhancement-mode pHemt Q1 in the low noise amplifier; and one end of the first capacitor C1 is configured to connect to the anode of the first diode, one end of the second capacitor C2 is configured to connect to the cathode of the last diode; and the other end of the first capacitor C1 and the other end of the second capacitor C2 are both configured to be grounded.