H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 19/00 (2006.01) H01L 23/64 (2006.01) H01L 23/66 (2006.01) H03H 7/38 (2006.01) H03H 11/28 (2006.01) H03K 3/01 (2006.01) H03K 19/0175 (2006.01) H01L 29/784 (1990.01)
Patent
CA 2071038
- 22 - DIGITALLY CONTROLLED ELEMENT SIZING 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 transistor 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 controlthe 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 obtainedfrom 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.
Gabara Thaddeus John
Knauer Scott Carroll
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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