Harmonic suppression in unbalanced analog MOSFET circuit topologies using body signals

Analytical and experimental results are presented which demonstrate that the nonlinearities of integrated MOS transistors operated in nonsaturation can be suppressed by driving the body terminals of these MOSFETs in an appropriate manner. In contrast with previous techniques, the proposed method does not require matched devices or operational amplifiers with differential outputs. It does require the correct choice of amplitude and phase of the body signal, which is derived from the input signal. Experimental measurements show that individual even or odd harmonics can be reduced at least 90 dB below fundamental in MOSFET-C filters/integrators, which compares favorable with results reported in the literatures for balanced topology techniques