Patent Number: 6,529,047

Title: Mixer driver circuit

Abstract: A mixer driver circuit including a differential pair, a differentialcurrent supply and a switched current sink. The differential pair has adifferential input for receiving a differential input signal. Thedifferential current supply provides a differential output and switches inresponse to switching of the differential pair to provide a differentialoutput current. The switched current sink biases the differential currentsupply and sinks current to drive the differential output signal. Thedifferential pair may be a resistive-loaded differential pair oftransistors biased by a constant current sink. The differential currentsupply may include a pair of emitter follower buffers. The mixer drivermay further include a pair of constant current sinks and a second pair ofemitter follower buffers, where the second pair of emitter followerbuffers is biased by the pair of constant current sinks and provides avoltage level shifting drive for the switched current sink.

Inventors: Prentice; John S. (Palm Bay, FL)


International Classification: H03D 7/14 (20060101); H03F 003/45 ()

Expiration Date: 03/02015