Harmonic rejection mixer

摘要

A harmonic rejection mixer is disclosed that is capable of supporting wideband reception without any increase in circuit area. In this apparatus, transistors convert an RF signal to currents. Transistors perform frequency conversion based on the currents from the transistors and local oscillation signals. Transistors distribute the currents from the transistors to all transistors or some transistors based on a predetermined ratio. A load adds up the currents from the transistors and converts the resultant current to a voltage.

主权项

1. A harmonic rejection mixer comprising:
five gain devices that convert a radio frequency signal to currents; five switching devices that perform frequency conversion based on the currents from the gain devices and local oscillation signals; an adder that is connected with the five switching devices and adds up the currents from the five switching devices and that converts the resultant current to a voltage; and a changeover switch that is connected with the five gain devices and the five switching devices and distributes the currents from the gain devices to the five switching devices or two switching devices based on a predetermined ratio; wherein, when the currents from the five gain devices are distributed to the five switching devices, the predetermined ratio is approximately sin(30°):sin(60°):sin(90°):sin(120°):and sin(150°), and when the currents from the five gain devices are distributed to the two switching devices, the predetermined ratio is approximately 1:1.