Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1991-06-28
1993-03-16
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307570, 307270, 307475, H03K 102, H03K 1730
Patent
active
051947650
ABSTRACT:
Effective control of impedance values in integrated circuit applications is achieved with an integrated circuit transistor whose size is digitally controlled. The digitally controlled size is achieved, for example, with a parallel interconnection of MOS transistors. In one application, the digitally controlled transitor serves as a controlled impedance connected to an output terminal of an integrated circuit. In that application, a number of transistors are enabled with control signals, and the collection of enabled transistors is responsive to the input signal that normally is applied to a conventional transistor. In another application, where the digitally controlled transistor serves as a controlled impedance at the input of a circuit, only the control signals that enable transistors and thereby determine the effective developed impedance are employed. In still another application, the digital control of the transistor's size is employed to control the speed or power consumption of the effective transistor. Such control is exercised to erase the manufacturing variability of the integrated circuit. Alternatively, such control is exercised as part of a feedback control of the operational characteristics of the entire circuit. In the feedback control application, the digital signals that control the transistor's size are obtained from an assessment of the circuit's operation. In the manufacturing variability control application, the digital signals that control the transistor's size are obtained from a measure of the integrated circuit's parameters relative to a reference element.
REFERENCES:
patent: 4584492 (1986-04-01), Sharp
patent: 4691127 (1987-09-01), Huizer
patent: 4825101 (1989-04-01), Walters, Jr.
patent: 4855623 (1989-08-01), Flaherty
patent: 5095231 (1992-03-01), Satori et al.
"A Self-Terminating Low-Voltage Swing CMOS Output Driver", IEEE Journal of Solid-State Circuits, vol. 23, No. 2, Apr. 1988, Thomas F. Knight, Jr., pp. 457-464.
Dunlop Alfred E.
Gabara Thaddeus J.
Knauer Scott C.
AT&T Bell Laboratories
Brendzel Henry T.
Roseen Richard
Westin Edward P.
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