A direct-conversion offset-cancellation mixer in 2.4 GHz CMOS Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1c18dj389

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  • We present a new circuit design for adaptive offset cancellation in a fully differential 2.4 GHz CMOS direct conversion mixer. Our circuit structure is a modification of a Gilbert cell mixer in which offsets are cancelled by injecting cancellation currents into the legs of the mixer by dynamically varying the bias on the active loads. We present analysis and simulation results of our mixer with offsets present. Offsets create non-linearities in any circuit by differentially shifting the small-signal bias point of a matched pair; forcing once symmetrical transistors to operate in different bias regions and create second order distortion. We focus our design to minimize second order distortion while simultaneously canceling the large offsets found in direct conversion receivers. Simulation results for the mixer canceling a wide range of offsets are included. Our mixer has a gain of 6.4dB, an IIP3 of 17dBm and a noise figure of 17dB as simulated in a .5μm HP Mosis CMOS process.
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