Highly-linear CMOS OTA with compensation of mobility reduction

This paper describes highly linear CMOS OTA with compensation of mobility reduction. The proposed OTA is circuitry of the adaptive bias based OTA with a tail current source, and can reduce the influence of the mobility reduction. Through Star-HSPICE simulations, we could confirm that the third-order harmonic (HD3) can be reduced by 26.6dB by using the proposed technique. Lastly, as an application of the proposed OTA, we design the 6th-order 0.05° equiripple continuous-time filter.