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A common mode feedback structure for differential OpAmps using NMOS depletion transistors

: Pasch, T.; Kleine, U.; Klinke, R.

Analog Integrated Circuits and Signal Processing 27 (2001), No.3, pp.191-196
ISSN: 0925-1030
ISSN: 1573-1979
Journal Article
Fraunhofer IMS ()

A fully differential amplifier featuring a novel common mode feedback (CMFB) structure is presented. Measurement results for the circuit made in a 0.8 m process prove that the new structure provides rail-to-rail common and differential mode input range that is difficult to handle for all active CMFB structures reported so far. This improvement is accomplished by the use of a nMOS depletion input pair transistors that can easily be processed in standard CMOS technologies. The differential OpAmp is designed for 3 V power supply and provides 61 dB amplification and a bandwidth of 24 MHz.