Patent ID: 7058375

Claim:
A low noise down converter for satellite broadcast receiving, comprising a mixer converting a received high-frequency signal into an intermediate-frequency signal, said mixer including: a transistor performing frequency conversion, a first bipolar transistor having an emitter connected to a drain of said transistor and a collector connected to a gate of said transistor, a temperature characteristic compensating circuit connected to a base of said first bipolar transistor and stabilizing a temperature characteristic of said first bipolar transistor; and a resistor circuit configured to adjust a rate of temperature change of a collector current of said first bipolar transistor; wherein said temperature characteristic compensating circuit includes a second bipolar transistor having a conductive terminal connected to the base of said first bipolar transistor, and said resistor circuit includes a first resistance element for adjusting the collector current of said first bipolar transistor, and a second resistance element for adjusting a collector current of said second bipolar transistor.