Circuit and method of compensating for threshold value of transi

Details Circuit and method of compensating for threshold value of transi Circuit and method of compensating for threshold value of transi

1997-03-19

1999-09-07

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327391, 327434, 327362, 327378, 326 31, 326 34, H03K 1716

Patent

active

059492708

ABSTRACT:
A capacitor is connected between the gate of a transistor that is an object of threshold voltage compensation and an input terminal. A switching device is connected between a current source connected to one terminal of the transistor and the gate of the transistor. A second switching device is connected between the input terminal and a terminal to which a reference voltage is applied. The switching device is turned ON so that the transistor is diode-connected. The switching device is turned ON, thus applying the reference voltage to the input terminal. A reference voltage is applied to a current inflow terminal connected to another terminal of the transistor. After charge dependent on the threshold voltage of the transistor is accumulated in the capacitor, the switching device is turned OFF. With this control, a difference of a threshold voltage from another deriving from the fine structure of transistors as well as a difference in threshold voltage between adjoining transistors can be compensated for.

REFERENCES:
patent: 4527074 (1985-07-01), Donalson et al.
patent: 4593206 (1986-06-01), Neidoff et al.
patent: 4689495 (1987-08-01), Liu
patent: 4864159 (1989-09-01), Cornelissen
patent: 5118971 (1992-06-01), Schenck
patent: 5481207 (1996-01-01), Crafts

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