Patent ID: 6564045
Filing Date: 2003-05-13
Classification: H03D

Abstract:
A frequency doubler that receives a differential signal having an in-phase component I and a quadrature component Q and outputs a signal having a frequency that is double the frequency of the input signal and a phase balance that is the same as the phase balance of the input signal, wherein the frequency doubler comprises:a first mixer core that receives the I component of the input signal on two input ports and mixes the I components to generate an I product; a second mixer core that receives the Q component of the input signal on two input ports and mixes the Q components to generate a Q product; means for subtracting the Q product from the I product to generate the in-phase component of the output signal; a third mixer core that receives the I component of the input signal on one input port and the Q component on another input port and mixes the I and Q components to generate an IQ product; a fourth mixer core that receives the I component of the input signal on one input port and the Q component on another input port and mixes the I and Q components to generate another IQ product; and means for adding the two IQ products to generate the quadrature component of the output signal.