Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1995-08-14
1998-02-03
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327 58, 327 62, 330253, 330257, H03F 345
Patent
active
057149062
ABSTRACT:
A low voltage constant transconductance input stage is achieved with relatively simple design methodology. The approach uses current-mode techniques and is based upon the processing of signal currents, rather than handling the bias currents of input stages. Such an approach becomes universal and independent of the input stage transistor types (FET or bipolar) and their operating regions. Further, the arrangement considerably simplifies the design procedure of low voltage operational amplifiers. MOS and bipolar Op Amp input stages are described wherein almost constant g.sub.m is achieved which is independent of the common mode input voltage ranging from rail-to-rail.
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Hwang Chang Ku
Ismail Mohammed
Motamed Ali
Callahan Timothy P.
Englund Terry L.
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