Calibrated-weight balance and an analog-to-digital converter in

Details Calibrated-weight balance and an analog-to-digital converter in Calibrated-weight balance and an analog-to-digital converter in

1986-11-07

1988-04-19

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

331113R, 331145, 307261, H03M 136

Patent

active

047393068

ABSTRACT:
A calibrated-weight balance for converting an electrical analog signal to a binary signal as applicable to flash-type analog-to-digital converters is composed of a bistable multivibrator having two transistors (15, 16) and two resistors (25, 26). In the reference channel (15, 25), a current I.sub.0 flows through a resistor (27) connected between drain and ground. In the measuring channel (16, 26), a transistor (17) is connected between a reference voltage (-V.sub.ref) and the drain of the measuring transistor (16). The input of the balance (V.sub.E) is the gate of the third transistor (17). The outputs (Q, Q) of the balance are the drains of the first and second transistors (15, 16). The resistor (26) for supplying the second transistor (16) constitutes the calibrated weight and permits the flow of a current which is a multiple of the current which flows through the resistor (27) of the reference channel.

REFERENCES:
patent: 4291246 (1981-09-01), Martino, Jr. et al.
RCA Review, vol. 41, Juin 1980, pp. 198-212, Princeton, US; L. C. Upadhyayula: "GaAs MESFET Comparators for Gigabit-Rate Analog-to-Digital Converters", *FIGS. 1,3,9; p. 204, lignes 1-7*.
Patents Abstracts, vol. 7, No. 49 (E-161), [1194], 24 Fevrier 1983; & JP-A-57 199 322 (Daini Selkosha K.K.), 07-12-1982.

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