Digitally controlled variable resistor

Details Digitally controlled variable resistor Digitally controlled variable resistor

1989-12-27

1991-09-03

Lateef, Marvin M.

Electrical resistors

Miscellaneous

338 48, 338306, 307490, 323354, 357 51, H01C 1300

Patent

active

050458329

ABSTRACT:
A compact and inexpensive variable resistor circuit has a value of resistance that can be set by a data signal. The variable resistor includes a number of variable individual resistances connected in series, and an electronic switch connected in parallel across each individual resistance. The values of the individual resistances are chosen to include a basic resistance value and a compensating resistance value, which corresponds to the impedance of the associated electronic switch in its closed state. The basic value is chosen from the progression 2.sup.0, 2.sup.1, 2.sup.2, 2.sup.3, and so on, so that the resistance of the variable resistor corresponds to the binary value of data applied to control the electronic switches. Other aspects of the invention include input and control circuitry which is designed to minimize its size and allow it to be packaged on an integrated circuit.

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patent: 4849903 (1989-07-01), Fletcher et al.
M. Satou et al., "A Volume and Tone Control IC for HiFi Audio", pp. 26, 27, 256. IEEE International Solid-State Circuits Conference, vol. 24, (1981).
R. Metz, "Combination Logic Cuts Parts in Digitally Controlled Amplifier" pp. 94, 95 Electronics, vol. 48, No. 19, (1975).
NASA TechBrief, "Electronically Controlled Resistor Bank," 2301 N.T.I.S. TechNotes (1988) Jan., Springfield, VA, U.S.A.
IBM Technical Disclosure Bulletin, "Compensating Non-Ideal Voltage Switches In Digital-to-Analog Converters (R/2R Conductors," vol. 28, No. 3, p. 1149, Aug. 1985.
Electronic Engineering, Oldrich Podzimek, "D/A Converter With V=N.sup.-1 Conversion," 57 (1985) Jan. No. 697, London, Great-Britain.
IBM Technical Disclosure Bulletin, Bachman, B. E., "Binary Programmed Power Supply," vol. 9, No. 10, p. 1330, Mar. 1967.

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