Unmatched field effect transistors providing matched voltage-con

Details Unmatched field effect transistors providing matched voltage-con Unmatched field effect transistors providing matched voltage-con

1975-11-26

1977-04-05

Goldberg, Gerald

Electricity: power supply or regulation systems

Remote sensing

307237, 307304, 323 22R, 330 39, H03G 330, H04B 110

Patent

active

040164810

ABSTRACT:
Matched voltage-controlled resistances are provided across the drain-to-source channels of a pair of FET's, each FET having a gate electrode connected through an associated control resistor to the same one terminal of a source of DC control voltage; having a source electrode electrically connected to the same other terminal of the voltage source; and having an associated feedback resistor electrically connected between its drain and gate electrodes. The drain electrodes are preferably capacitively coupled to input or output terminals to prevent DC loading of the FET network by external circuitry. A resistor is also connected across the drain-to-source channel of each FET to limit the maximum value of net resistance presented thereby. The resistance of one of the control resistors is adjusted to have a value which causes the net drain-to-source resistance of the associated FET to have the same value as that of the other FET for a particular value of control voltage. The net drain-to-source resistances of the two FET's are then closely matched over a range of control voltages.

REFERENCES:
patent: 3748495 (1973-07-01), Messinger
patent: 3904975 (1975-09-01), Satoh
patent: 3944853 (1976-03-01), Cooper
Siliconix Inc. Application Note "FET's as Voltage-Controlled Resistors" by D. Capella; Feb. 1973, pp. 1-12.
Electronic Design, Sept. 13, 1965; pp. 66-69, "FET's as Voltage-Variable Resistors" by C. D. Todd.
Solid State Design, Aug. 1965, pp. 12-14, "FET's as Voltage Controlled Resistors" by J. S. Sherwin.
Proc. of IEEE Oct. 1968, pp. 1718-1719, "Reducing Distortion in Controlled Attenuators Using FET" by H. P. von Ow.
IEEE Trans. on Audio, Sept./Oct. 1965, vol. AU-13, No. 5, pp. 112-120.
Teledyne S.C. Manual, June 1972, pp. 95-96, "Junction FET's Theory & Applications".

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