Patent ID: 7606551
Filing Date: 2009-10-20
Classification: H03D

Abstract:
1. A mixer circuit for use with a first input signal exhibiting a first input frequency and a second input signal that exhibits a second input frequency, said mixer circuit comprising: a balanced frequency mixer having a first input to which said first input signal is supplied and a second input to which said second input signal is supplied, said balanced frequency mixer comprising at least two amplifier elements respectively formed by varactor diodes that mix said first and second input signals with each other to form a mix signal having a first signal component and a second signal component, said first signal component exhibiting a first component frequency that is a sum of the frequencies of said first and second input signals, and said second signal component having a second component frequency that is a difference between the frequencies of the first and second input signals; said frequency mixer being connected to an output at which an output signal is tapped that comprises at least one of said first signal component and said second signal component; and said second input being decoupled from said output and said second input frequency being a multiple of said first input frequency; and each of said veractors having an adjustment circuit connected in parallel therewith that adjusts an operating point of that veractor diode.