Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1996-03-19
1999-01-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327 58, 327 65, 327333, 327562, 330253, H03F 345, H03F 318
Patent
active
058642544
ABSTRACT:
A differential amplifier circuit includes a differential amplifier having inversion and non-inversion input terminals and input amplifiers each individually connected to one of these input terminals, serving to receive an input voltage within a certain range and output it as another voltage in a smaller range. The differential amplifier is of a kind using n-type and p-type MOS transistors with threshold voltages given respectively by V.sub.thn and V.sub.thp, and connected to a source voltage V.sub.DD and a reference voltage V.sub.ref. Input voltages to the input amplifiers within the range between V.sub.ref and V.sub.DD, are outputted within the range between (V.sub.DD -V.sub.thp) and (V.sub.ref +V.sub.thn), or preferably between (V.sub.DD -1.5V.sub.thp) and (V.sub.ref +1.5V.sub.thn). The input amplifiers may each comprise a CMOS buffer circuit having an output line connected to the differential amplifier and impedance elements such as resistors or transistors with one connected between the output line and the reference voltage and another connected between the output line and the source voltage.
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Callahan Timothy P.
Englund Terry L.
Rohm & Co., Ltd.
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