Enhanced IIP2 Chopper Stabilized Direct Conversion Mixer Architecture

摘要

This paper presents an improved Second Order Input Intercept Point (IIP2) Direct Conversion Mixer architecture by introducing chopping in the standard active double balanced mixer. The mixing frequency required is half of the RF frequency. This technique improves the second order linearity of the mixer. There is only one active mixer in the signal path enabling low power design. Simulation results for the enhanced mixer are compared with a standard active double balanced mixer. An IIP2 improvement of around 8 dB is demonstrated.