Apparatus for a low voltage differential amplifier incorporating

Details Apparatus for a low voltage differential amplifier incorporating Apparatus for a low voltage differential amplifier incorporating

1995-05-15

1996-10-15

Mullins, James B.

Amplifiers

With periodic switching input-output

330253, 330261, 327 65, H03F 345

Patent

active

055658130

ABSTRACT:
A low voltage differential amplifier 10 or comparator is accomplished by providing an differential amplifier 10 that includes a transistor bias simulator 32 and a capacitance circuit 36. The transistor bias simulator 32 matches the gate to source bias voltage of the load transistor 22 and provides this value to the capacitance circuit 36. The capacitance circuit 36, which is coupled to a biasing reference voltage 38, charges a capacitor 84 based on the difference between the biasing reference voltage 38 and the simulated bias voltage 34. This charged capacitor 86 is used during an auto-zeroing phase to bias the drain to source voltage of the load transistor 22 to a state at which it is just beyond the onset of saturation.

REFERENCES:
patent: 4264872 (1981-04-01), Suzuki
patent: 4710724 (1987-12-01), Connell et al.
patent: 5124663 (1992-06-01), McEntarfer et al.
Hodges et al., "Potential of MOS Technologies for Analog Integrated Circuits", IEEE J. Solid-State Circuits, vol. SC-13, pp. 285-294, Jun. 1978.

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