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

Claim 1:
2. The blocking signal cancellation low noise amplifier system as claimed in claim 1, wherein the first low noise amplifier comprises a transistor M11, a transistor M12, a transistor M13, a transistor M14, a transistor M15, a transistor M16, an inductor L10, an inductor L11, an inductor L12, an inductor L13, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13 and a capacitor C14;
a second pole of the transistor M11 and a second pole of the transistor M12 are respectively connected to a first terminal and a second terminal of the inductor L13, and a third terminal of the inductor L13 is grounded; a control pole and the second pole of the transistor M11 are connected with the capacitor C11, the control pole of the transistor M11 is also used to connect a positive terminal of the input signal of the first low noise amplifier through the inductor L11; the control pole of the transistor M11 is also connected with a first pole of the transistor M15 through the capacitor C13, and a second pole of the transistor M15 is grounded; the capacitor C12 is connected between a control pole and the second pole of the transistor M12, and the control pole of the transistor M12 is also used to connect a negative terminal of the input signal of the first low noise amplifier through the inductor L12; the control pole of the transistor M12 is also connected to a first pole of the transistor M16 through the capacitor C14, and a second pole of the transistor M16 is grounded;
a second pole of the transistor M13 is connected to a first pole of the transistor M11; a control of the transistor M13 is connected to a control pole of the transistor M14, and is used to receive a voltage signal VCAS1; a first pole of the transistor M13 is connected to one end of the capacitor C10, and the other end of the capacitor C10 is connected to a first pole of the transistor M14; the first pole of the transistor M13 is also connected to a first end of the inductor L10, a second end of the inductor L10 is connected to the first pole of the transistor M14, and a third end of the inductor L10 is used to receive a working voltage VDD; a second pole of the transistor M14 is connected to a first pole of the transistor M12;
the control pole of the transistor M11 also receives the DC bias voltage signal VB1 or the DC bias voltage signal VB2 through the bias switching circuit; the control pole of the transistor M12 also receives the DC bias voltage signal VB1 or the DC bias voltage signal VB2 through the bias switching circuit; wherein, the first switching signal comprises a control voltage VEN of a first state and a control voltage Vblk of a second state; when the first switching signal is received, the bias switching circuit responds to the control voltage VEN of the first state to disconnect the DC bias voltage signal VB1 from the control pole of the transistor M11, and responds to the control voltage Vblk of the second state to connect the DC bias voltage signal VB2 to the control pole of the transistor M11; the second switching signal comprises a control voltage VEN in the second state and a control voltage Vblk in the first state; when the second switching signal is used, the bias switching circuit connects the DC bias voltage signal VB1 to the control pole of the transistor M11 in response to the control voltage VEN in the second state, and responds to the control voltage Vblk in the first state to disconnect the DC bias voltage signal VB2 from the control pole of the transistor M11; control poles of the transistor M15 and the transistor M16 are also used to receive the control voltage VEN; and
the first pole of the transistor M13 and the first pole of the transistor M14 serve as a negative terminal and a positive terminal of an output of the first low noise amplifier respectively.