Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Reexamination Certificate
2006-02-14
2006-02-14
Ton, My-Trang Nu (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
C330S253000, C330S300000
Reexamination Certificate
active
06998907
ABSTRACT:
An input stage employs low-voltage MOSFETs as input devices for an operational amplifier circuit that operates at common mode voltages that may exceed the gate-oxide breakdown voltage of the input devices. Also, the input stage is arranged for relatively low noise. The input stage is arranged to detect the input common mode voltage and to feed back the detected input common mode voltage to a base of a bipolar folded cascode transistor that is coupled to the drain of the input devices. Accordingly, the input devices are bootstrapped such that they are protected from gate-oxide breakdown.
REFERENCES:
patent: 4897612 (1990-01-01), Carroll
patent: 5587687 (1996-12-01), Adams
patent: 6563382 (2003-05-01), Yang
patent: 6924701 (2005-08-01), Bhandari
Kindt Willem J.
Sprakelaar Gertjan V.
Darby & Darby PC
Gaffney Matthew M.
National Semiconductor Corporation
Nu Ton My-Trang
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