Mixer circuit

A mixer circuit is characterized by including a transconductance stage circuit, a switch stage circuit and a load stage circuit which are electrically connected in sequence;

• The transconductance stage circuit uses a transistor superposition technology structure and a source degenerate inductance structure, which is used to access the radio frequency voltage signal and convert the radio frequency voltage signal into a radiofrequency current signal;
• The switch stage circuit is used to access the local oscillator signal and the radio frequency current signal, and use the local oscillator signal to control the switch stage transistor to turn on in turn to output the intermediate frequency current signal;
• The load stage circuit is used to convert the intermediate frequency current signal into a voltage signal output;
• The transconductance stage circuit includes a transistor M1, a transistor M2, a transistor M3, a transistor M4, an inductor L1, an inductor L2, and an inductor L3;
• the gate of the transistor M1 is connected to the positive terminal RF+ of the radio frequency voltage signal, and the transistor M1 The drain is connected to the drain of the transistor M2, the source of the transistor M1 is connected to one end of the inductor L2, the other end of the inductor L2 is grounded;
• the gate of the transistor M2 is connected to the gate of the transistor M1, and the source of the transistor M2 is grounded;
• The gate of the transistor M4 is connected to the negative terminal RF− of the radio frequency voltage signal, the drain of the transistor M4 is connected to the drain of the transistor M3, the source of the transistor M4 is connected to one end of the inductor L3, and the The other end is grounded;
• the gate of the transistor M3 is connected to the gate of the transistor M4, and the source of the transistor M3 is grounded;
• one end of the inductor L1 is connected to the drain of the transistor M1, and the other end is connected to the drain of the transistor M4.