| 摘要 |
<p>Provided is a mixer circuit, comprising: a differential motion amplifier (10) which is configured of a one-stage differential motion amplifier transistor pair (111, 112), wherein a first differential motion signal is inputted, and the first differential motion signal is amplified and outputted via first matching circuits (121, 122); a multiplier (20), which is configured of one-stage differential motion switching transistor pairs (211, 212, 213, 214), wherein a second differential motion signal, and the first differential motion signal which the differential motion amplifier has amplified and outputted, are inputted, the first differential motion signal being inputted via second matching circuits (221, 222), the second differential motion signal and the first differential motion signal which the differential motion amplifier has amplified and outputted are multiplied and outputted as a third differential motion signal; and a capacitance coupling unit (30) which connects the first matching circuits of the differential motion amplifier and the second matching circuits of the multiplier, and galvanically isolates the differential motion amplifier and the multiplier. Power is supplied to the differential motion amplifier transistor pair of the differential motion amplifier and the differential motion switching transistor pairs of the multiplier in isolation from one another, thus providing a mixer circuit which operates at low voltage and has strong power saturation and conversion gain.</p> |
