High voltage, low-offset operational amplifier with...

Details High voltage, low-offset operational amplifier with... High voltage, low-offset operational amplifier with...

2006-06-20

2006-06-20

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

Reexamination Certificate

active

07064609

ABSTRACT:
An operational amplifier with two differential pairs coupled to different current sources. The gate terminals of the transistors in the first differential pair are used as input terminals providing common mode input for most of the rail-to-rail voltage. The bulk terminals of the transistors in the second differential pair are used as input terminals providing common mode input for the remainder of the rail-to-rail voltage to thereby accomplish full rail-to-rail common mode. By using the bulk terminals of the field effect transistors in the second differential pair, rather than the gate terminals, as the input terminal, the operational amplifier may be constructing in a single well, thereby being compatible with standard digital CMOS processes. Alternatively, the bulk-driven transistors may be replaced with gate-driven depletion type transistors. The high voltage transistors in the output stage further reduce the offset voltage of the operational amplifier.

REFERENCES:
patent: 4638259 (1987-01-01), Saari
patent: 5808513 (1998-09-01), Archer
patent: 6218892 (2001-04-01), Soumyanath et al.
patent: 6590453 (2003-07-01), Tran et al.
patent: 6657495 (2003-12-01), Ivanov et al.
A 1-V 5 uW CMOS-Opamp with Bulk-Driven Input Transistors Kimmo Lasanen, Elvi Raisanen-Ruotsalainen, Juba Kostamovaara IEEE 2000.
Designing -V Op Amps Using Standard Digital CMOS Tecnology Benjamin J. Blalock, Phillip E. Allen, Gabriel A. Rincon-Mora IEEE 1998.

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