Differential amplifier, comparator and high-speed A/D converter

Details Differential amplifier, comparator and high-speed A/D converter Differential amplifier, comparator and high-speed A/D converter

1992-12-10

1995-03-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

330295, 327563, H03F 345

Patent

active

053961315

ABSTRACT:
Disclosed is a high-speed A/D converter (15) including an improved differential amplifier circuit. Each comparator (61) provided in the A/D converter directly receives a complementary or differential analog input voltage to be converted. A differential amplifier circuit provided in each comparator compares an applied analog input voltage difference and an applied reference voltage difference. A binary signal indicative of a comparison result is applied to an encoder (4) through a binarization circuit. An analog input voltage which is not to be converted is directly applied to the comparator, that is, to the differential amplifier circuit through none of resistor elements and components, whereby conversion time delay is prevented.

REFERENCES:
patent: 4109214 (1978-08-01), Main
patent: 4390848 (1983-06-01), Blauschild
patent: 4752766 (1988-06-01), Shimizu et al.
patent: 4774498 (1988-09-01), Traa
patent: 4939518 (1990-07-01), Hotta et al.
patent: 5122760 (1992-06-01), Nishijima
"A 10b 30MHZ Two-Step Parallel BiCMOS ADC with Internal S/H", by Akira Matsuzawa et al., 1990 IEEE International Solid-State Circuits Conference, pp. 162-163 and 290.
"Single-Transistor and Two-Transistor Amplifiers", pp. 194-203.
"A 10-b 15-MHz CMOS Recycling Two-Step A/D Converter", by Bang-Sup Song et al., IEEE Journal of Solid-State Circuits, vol. 25, No. 6, Dec. 1990, pp. 1328-1338.

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