Patent ID: 7418062
Filing Date: 2008-08-26
Classification: H03D

Abstract:
1. A mixing circuitry for mixing respective single serial digital bit stream in-phase signal and single serial digital bit stream quadrature phase signal through a set of logic gates to produce a digital representation of downcoverted in-phase and quadrature components, the mixing circuitry comprises, for each significant bit: first exclusive-OR gate coupled to receive as first input an in-phase digital bit stream and as second input a high accuracy sine function bit stream; second exclusive-OR gate coupled to receive as first input the in-phase digital bit stream and as second input a high accuracy cosine function bit stream; third exclusive-OR gate coupled to receive as second input a quadrature phase digital bit stream and as first input the high accuracy cosine function bit stream; fourth exclusive-OR gate coupled to receive as second input the quadrature phase digital bit stream and as first input the high accuracy sine function bit stream; first OR gate for logically adding the outputs of the first and second XOR gates for the in-phase channel; first AND gate for logically multiplying the outputs of the first and second XOR gates for the in-phase channel; second OR gate for logically adding the outputs of the third and fourth XOR gates for the quadrature phase channel; and second AND gate for logically multiplying the outputs of the third and fourth XOR gates for the quadrature phase channel.