Patent ID: 6438365
Filing Date: 2002-08-20
Classification: H03D,H03F

Abstract:
A balanced mixer circuit comprising:a first differential input port for providing an input radio frequency to the balanced mixer circuit; a second differential input port for providing a local oscillator frequency to the balanced mixer circuit; a transconductance amplifier means for receiving and converting the input radio frequency into a collector current, said transconductance amplifier means being coupled to the first input port; a splitter circuit means for splitting the collector current, said splitter means being coupled to the transconductance amplifier means; a mixer means for receiving a first portion of a split output of the splitter circuit means and the local oscillator frequency, said mixer means being coupled to the splitter circuit means and the second differential input port; a first feedback means for providing a first feedback current to the first input port, said first feedback means coupled between a second portion of the split output of the splitter circuit means and the first input port; a second feedback means for providing a second feedback current to the first input port, said second feedback means being coupled to the transconductance amplifier means; and an output port coupled to the mixer means.