Differential amplifiers which can form a residue amplifier in su

Details Differential amplifiers which can form a residue amplifier in su Differential amplifiers which can form a residue amplifier in su

1995-01-05

1996-06-25

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

330252, H03M 114, H03F 345

Patent

active

055304443

ABSTRACT:
Open-loop differential amplifiers (120, 140) are disclosed which have accurate and stable gain. The gain of these amplifiers is substantially insensitive to the effects of small-signal emitter resistance r.sub.e, current gain .beta. and Early voltage V.sub.A. Thus, their gain can be accurately set by resistance ratios which makes them particularly useful in integrated circuits. These advantages are obtained with an output differential pair (67) that has cross-coupled base and collector terminals. In addition, resistors (141, 143, 148, 150) and a current source (146) associated with this differential pair are related to like elements (27, 28, 24, 25 and 26) that are associated with an input differential pair (21) by disclosed numerical ratios, e.g., the nominal gain G of the amplifier. Versions of the amplifiers can be adapted for use as a residue amplifier (162) in a subranging A/D converter (160).

REFERENCES:
patent: 4468629 (1984-08-01), Choma, Jr.
patent: 4490685 (1985-12-01), Sano et al.
patent: 4820997 (1989-04-01), Sano et al.
patent: 5313207 (1994-05-01), Kouno et al.
William T. Colleran et al., "A 10-b, 75MHz Two-Stage Pipelined Bipolar A/D Converter", IEEE Journal of Solid-State Circuits, vol. 28, No. 12, Dec. 1993, pp. 1187-1199
Takahiro Miki, et al., "A 10-b, 50MS/s, 500-W A/D Converter Using a Differential-Voltage Subconverter", IEEE Journal of Solid-State Circuits, vol. 29, No. 4, Apr. 1994, pp. 516-521.

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