Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

1980-11-19

1982-11-09

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

307362, H03K 1302

Patent

active

043587526

ABSTRACT:
A differential amplifier, which is associated with a digital-to-analog converter and a register and serves as an element of an analog-to-digital converter, having the offset input voltage characteristic determined by selecting, for example, the ratio of the emitter areas of a first pair of transistors so that no offset characteristic is required for the digital-to-analog converter associated with the differential amplifier. The offset input voltage can also be determined by selecting the ratio of the emitter areas of a second pair of transistors each one of the second pair of transistors connected to a different one of the first transistors and each one of the second pair of transistors having a current source of the same magnitude. The offset characteristic can also be determined by selecting unequal magnitudes of the current sources connected to the second pair of transistors when the ratio of the second pair of transistor emitter areas are equal. The offset characteristic can also be selected by selecting both the second pair of transistors emitter areas ratios and the second transistor current source magnitudes as not equal or by selecting any combination of the above current magnitudes or emitter area ratios.

REFERENCES:
patent: 3688209 (1972-08-01), Winkel
patent: 3717821 (1973-02-01), Amemiya
patent: 3882484 (1975-05-01), Brokaw
patent: 4035784 (1977-07-01), Brown
patent: 4095164 (1978-06-01), Ahmed
patent: 4109215 (1978-08-01), Comer
Analog Devices Co., "Data Acquisition Product Catalog", 1978, pp. 289-294.

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