Patent ID: 7302011

Claim:
A quadrature frequency doubling system comprising: a) first circuitry adapted to provide, in response to receiving a reference signal from an oscillator: i) a first signal having a first frequency F LO ; ii) a second signal having the first frequency F LO and being essentially 45 degrees out of phase with said first signal; iii) a third signal having the first frequency F LO and being essentially 90 degrees out of phase with said first signal; and iv) a fourth signal having the first frequency F LO and being essentially 90 degrees out of phase with said second signal; and b) second circuitry adapted to provide an in-phase signal based on said first signal and said third signal and a quadrature signal based on said second signal and said fourth signal, wherein said in-phase signal and said quadrature signal have a second frequency equal to twice the first frequency F LO and said quadrature signal is essentially 90 degrees out of phase with said in-phase signal, and wherein said in-phase signal and said quadrature signal are provided to a transmit modulator to modulate a baseband signal.