Patent ID: 6308058
Filing Date: 2001-10-23
Classification: H03D

Abstract:
An image reject mixer circuit arrangement, comprising:a) an input amplifier having a single-ended input and a single-ended output;b) first and second mixer cores each having respective first and second inputs; andc) first and second current mode phase-splitters, each of the phase-splitters having a respective input and two substantially complementary outputs, the inputs of both of the phase-splitters being connected to the output of the input amplifier, the outputs of the phase-splitters being arranged to carry signals at substantially the same frequency as the signals at the output of the input amplifier, the inputs of the first mixer core being connected to two of the outputs of the phase-splitters, the first mixer core being arranged to mix signals provided at these phase-splitter outputs with an oscillatory signal, the inputs of the second mixer core being connected to the other two of the phase-splitter outputs, the second mixer core being arranged to mix signals provided at these other phase-splitter outputs with a phase-shifted version of the oscillatory signal.