Out-of-Band Immunity to Interference of Single-Ended Baseband Amplifiers Through IM 2 Cancellation
ED Totev (Philips Research)
C Huang (Brightsight BV)
L.C.N. de Vreede (TU Delft - Electronics)
John R. Long (University of Waterloo)
W.A. Serdijn (TU Delft - Bio-Electronics)
CJM Verhoeven (TU Delft - Electronics)
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Abstract
The effect of second-order intermodulation (IM2) distortion produced by out-of-band, high-frequency interference on baseband/IF amplifiers is analyzed using the Volterra series. It is shown that a compensation loop designed to trap nonlinear currents improves the immunity of differential stages to IM2 distortion generated by local feedback. Measurements of a single-ended amplifier example implementing the proposed method demonstrate an IP2 increase of more than 30 dB
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