Cascaded Polynomial Adaptive Filters for Nonlinearity Compensation in Circuits

Digital compensation is a widely used methodology to compensate for circuit nonidealities and design robust analog and mixed-signal systems. In this work, we use nonlinear cascaded polynomial adaptive filters to compensate for nonlinear nonidealities in bipolar junction transistor (BJT) and metal oxide semiconductor field effect (MOS) based amplifiers which find applications as a front end block in mixed-signal systems. Several architectures are proposed and simulation results on 16-bit data obtained from cadence simulations indicate that the proposed methods result in signal to noise and distortion ratio (SNDR) improvement of up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$67. 22dB$</tex> and spurious free dynamic range (SFDR) improvement of up to <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$70. 87dB$</tex>, respectively for BJTs, and SNDR and SFDR improvement of upto <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$42. 64dB$</tex> and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$46. 72dB$</tex> respectively for MOS circuits.