Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1989-10-02
1991-04-02
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
323313, 323316, H03F 345
Patent
active
050049860
ABSTRACT:
An improved operational amplifier generates an output signal which varies according to plural input signals. An input stage accepts the input signals and outputs an intermediate signal according to the input signals, and generates an internal control signal in place of an external control signal. A current source provides a current according to the internally provided control signal. A conversion stage generates an output signal as a function of the intermediate signal and the current. An output driver stage drives the output signal to a load and buffers the operational amplifier from the load. A precision voltage reference generator based upon the operational amplifier provides a stable voltage reference signal. The output driver provides an internal feedback signal to the input stage, in place of the external input signals, and a bandgap reference cell in the first state establishes a voltage for the output driver in place of an external bias signal.
REFERENCES:
patent: 3551836 (1970-12-01), Greeson, Jr.
patent: 4755767 (1988-07-01), Yamatake
patent: 4797577 (1989-01-01), Hing
Gray and Meyer, Analysis and Design of Analog Integrated Circuits, 2nd ed., John Wiley & Sons (1984), pp. 237-238, 253-262, and 364.
A Brokaw, "A Simple Three-Terminal IC Bandgap Reference", IEEE Journal of Solid-State Circuits, vol. SC-9, No. 6, Dec. 1974, pp. 388-393.
Nakajima et al, "A High-Speed High-Precision Monolithic Folding Amplifier for PCM Systems", 1973 IEEE International Solid-State Circuits Conference, Feb. 14, 1973, pp. 20, 21, 184.
Advanced Micro Devices , Inc.
Mullins James B.
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