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

Claim 7:
8. The blocking signal cancellation low noise amplifier system as claimed in claim 7, wherein the envelope detection circuit comprises a transistor M30, a transistor M31, a transistor M32, an inductor L31, an inductor L32, a capacitor C31 and a capacitor C32;
a first pole of the transistor M31 is connected to a first pole of the transistor M32, a second pole of the transistor M31 is grounded, and a control pole of the transistor M31 also receives a bias voltage Vth1 through the inductor L31; the control pole of the transistor M31 is connected to one end of the capacitor C31, and the other end of the capacitor C31 is used as a negative terminal of an input of the envelope detection circuit;
a second pole of the transistor M32 is grounded, and a control pole of the transistor M32 also receives a bias voltage Vth2 through the inductor L32; the control pole of the transistor M32 is connected to one end of the capacitor C32, and the other end of the capacitor C32 is used as a positive terminal of the input of the envelope detection circuit; and
a first pole of the transistor M30 is connected to the first pole of the transistor M31, a second pole of the transistor M30 is used to receive a working voltage VDD, and a control pole of the transistor M30 is used to receive a voltage VBen; the first pole of the transistor M31 also serves as an output terminal of the envelope detection circuit.