Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1990-06-06
1991-06-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330277, H03F 345, H03F 316
Patent
active
050235672
ABSTRACT:
A stability-compensated, integrated-circuit operational amplifier has an open-loop gain versus frequency characteristic which provides stable and accurate closed-loop operation in numerous overall circuits including a CMOS circuit for producing a precision current as a reference to a digital-to-analog converter. The operational amplifier comprises an inverting node and a non-inverting node, and CMOS circuitry defining two differential amplifiers. Each differential amplifier is connected to the inverting node and the non-inverting node. The first differential amplifier has an output node, and produces on the output node an output potential that defines an output signal having a magnitude that is a function of the magnitude of the difference between a first potential at the inverting node and a second potential at the non-inverting node. The second differential amplifier is also connected to the inverting node and the non-inverting node. The second differential amplifier produces a compensation signal. The operational amplifier further includes capacitive circuitry for coupling the compensation signal to the non-inverting node.
REFERENCES:
patent: 4284957 (1981-08-01), Hague
patent: 4714895 (1987-12-01), Nicollini et al.
patent: 4868482 (1989-09-01), O'Shaughnessy et al.
O'Shaughnessy Timothy G.
Spaur Mike
Mottola Steven
Western Digital Corporation
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