A compact linearly tunable low voltage triode OTA using self-cascodes

A new triode OTA suited for low voltage high frequency applications is proposed. Based on the core Enz' OTA, self-cascodes are utilized to increase its operating frequency. Designed in an AMS 0.35μm CMOS process, simulation results show that the circuit attained a bandwidth of 78MHz. It also provides an SFDR of 73 dB for a 1MHz, 1.1V
_PP
differential input. A wide g
_m
tuning range of 9 is also achieved enhancing the suitability of the OTA for programmable filters in multi-standard receivers.