Semiconductor differential amplifier having feedback bias contro

Details Semiconductor differential amplifier having feedback bias contro Semiconductor differential amplifier having feedback bias contro

1979-02-09

1980-07-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330258, 330259, H03F 345, H03F 316

Patent

active

042130980

ABSTRACT:
An MOS differential amplifier includes a pair of substantially identical branches, each branch having a signal input MOS transistor feeding a separate MOS load transistor. Both branches are supplied current by a single current-source MOS transistor. In order to stabilize the (source-to-drain) bias voltages of the signal input and load transistors against fluctuations caused by semiconductor wafer-to-wafer processing variations, an auxiliary amplifier branch is added (for sensing the bias voltage) together with a feedback loop to the current-source (for controlling the current in response to the sensing of the bias voltage).

REFERENCES:
Hosticka et al., "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators", IEEE Journal of Solid-State Circuits, vol. SC-12, No. 6, Dec. 1977, pp. 600-608.
Tsividis, "Design Considerations in Single-Channel MOS Analog Integrated Circuits-A Tutorial", IEEE Journal of Solid-State Circuits, vol. SC-13, No. 3, Jun. 1978, pp. 383-391.

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