This brief introduces four different structures for implementing a continuous-time common-mode feedback (CMFB) network for fully differential (FD) amplifiers. The proposed circuits use bulk-driven MOS transistors, thus representing a low-voltage realization of their gate-driven counterparts. The CMFB circuits were included in a 1.5-V FD buffer implemented in standard 0.35-μm CMOS technology. Experimental results illustrate the performance of the proposed schemes, demonstrating their suitability to operate with a low supply voltage.
['J.M. Carrillo', 'Guido Torelli', 'M.A. Dominguez', 'R. Perez-Aloe', 'José M. Valverde', 'J. Francisco Duque-Carrillo']
A Family of Low-Voltage Bulk-Driven CMOS Continuous-Time CMFB Circuits