Apparatus and method for improved chopping mixer

Details Apparatus and method for improved chopping mixer Apparatus and method for improved chopping mixer

2005-08-23

2005-08-23

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

C455S333000

Reexamination Certificate

active

06933766

ABSTRACT:
An apparatus and method for an improved chopping mixer (100) having a bipolar mixer stage (140) for mixing signals (lp, In, LOp, LOn) received thereby; an output chopping stage (160); and an AC coupling stage (150) for coupling the mixed signal to the output chopping stage. The signal prior to the chopping output stage is centered at the chopping clock frequency rather than DC. AC coupling allows removal of common mode signal in a desired frequency range. Also, the second order component present on each single ended output will also be DC blocked by the AC coupling capacitors, resulting in improved second order IP2 performance.

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Pascal Philippe et al., “A Multioctave Active GaAs MMIC Quadrature Phase Shifter,”IEEE Transactions on Microwave Theory and Techniques, Dec. 1989, pp. 2119-2124, vol. 37, No. 12, New York, USA.

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