Patent ID: 7277683

Claim:
A synthesizer circuit for generating complementary sin and cos oscillator signals from an input oscillator signal x(t), said complementary sin and cos oscillator signals being shifted in frequency from said input oscillator signal x(t), said synthesizer circuit comprising: a divider having an input and generating divided sin and cos outputs based on a signal received at said input; a first mixer for receiving said input oscillator signal x(t), and mixing said input oscillator signal x(t) with said sin output of said divider to generate an output signal; a second mixer for receiving said input oscillator signal x(t), and mixing said input oscillator signal x(t) with said cos output of said divider to generate an output signal; a first removal means for receiving said output signal of said first mixer and removing undesired frequency signals from said output signal, providing said frequency-shifted cos oscillator signal as an output; the frequency-shifted cos oscillator signal output of said first removal means also being connected to the input of said divider; and a second removal means for receiving said output signal of said second mixer and removing undesired frequency signals from said output signal, thus providing said frequency-shifted sin oscillator signal as an output.