| 主权项 |
1. A sub-harmonic mixer for converting a Radio Frequency, RF, signal to an Intermediate Frequency, IF, signal, the sub-harmonic mixer comprising:
a Local Oscillator, LO, input to receive an LO signal; an RF input to receive the RF signal; an IF output to output the IF signal; and a circuit comprising two or more cascaded stages, wherein
each stage having an input and an output, the output of each stage is coupled to the input of a next stage by a capacitor;each stage comprising a common-emitter transistor having a base, a collector and an emitter, or a common-source transistor having a gate, a drain and a source;the input of each stage is at the base or gate of the transistor, the output of each stage is at the collector or drain of the transistor;an Alternating Current, AC, choke is coupled at the collector or drain of each transistor; andthe emitter or source of each transistor is connected to a ground; and wherein the LO input is coupled to the input of a first stage of the two or more stages; the RF input is coupled to the output of the first stage of the two or more stages; and the IF output is coupled to the output of a last stage of the two or more stages. |
