Patent ID: 11888454
Assignee: THE CHINESE UNIVERSITY OF HONG KONG, SHENZHEN
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The blocking signal cancellation low noise amplifier system as claimed in claim 1, wherein the second low noise amplifier comprises a transistor M21, a transistor M22, a transistor M23, a transistor M24, a transistor M25, a transistor M26, an inductor L20, an inductor L21, an inductor L22, an inductor L23, an inductor L24, a capacitor C20, a capacitor C21, a capacitor C22, a capacitor C23 and a capacitor C24;
a first pole of the transistor M21 is connected to a first pole of the transistor M24, a second pole of the transistor M21 is grounded, and a control pole of the transistor M21 also receives the class-C bias voltage VBC through the inductor L21; the control pole of the transistor M21 is also connected to one end of the capacitor C21, the other end of the capacitor C21 is connected to one end of the capacitor C23, the other end of the capacitor C23 is connected to a control pole of the transistor M23, and the control pole of the transistor M23 also receives the class-A bias voltage VBA through the inductor L23; a second pole of the transistor M23 is grounded; the end where the capacitor C21 is connected to the capacitor C23 is also used as a negative terminal of an input of the second low noise amplifier;
a first pole of the transistor M22 is connected to a first pole of the transistor M23, a second pole of the transistor M22 is grounded, and a control pole of the transistor M22 also receives the class-C bias voltage VBC through the inductor L22; the control pole of the transistor M22 is also connected to one end of the capacitor C22, the other end of the capacitor C22 is connected to one end of the capacitor C24, the other end of the capacitor C24 is connected to a control pole of the transistor M24, and the control pole of the transistor M24 also receives the class-A bias voltage VBA through the inductor L24; a second pole of the transistor M24 is grounded; the end where the capacitor C22 is connected to the capacitor C24 is also used as a positive terminal of the input of the second low noise amplifier;
a second pole of the transistor M25 is connected to the first pole of the transistor M21; a control of the transistor M25 is connected to a control pole of the transistor M26, and is used to receive a voltage signal VCAS2; a first pole of the transistor M25 is connected to one end of the capacitor C20, the other end of the capacitor C20 is connected to a first pole of the transistor M26; the first pole of the transistor M25 is also connected to a first end of the inductor L20, a second end of the inductor L20 is connected to the first pole of the transistor M26, and a third end of the inductor L20 is used to receive a working voltage VDD; a second pole of the transistor M26 is connected to the first pole of the transistor M22; and
the first pole of the transistor M25 and the first pole of the transistor M26 serve as a negative terminal and a positive terminal of an output of the second low noise amplifier respectively.