Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1992-12-07
1994-08-23
Westin, Edward P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307451, 307360, 307290, H03K 5153, H03K 3295, H03K 190185
Patent
active
053410467
ABSTRACT:
A method and apparatus for controlling a threshold of pad input circuits of an integrated circuit such that variations in manufacturing and environment will not substantially change its operating characteristics. The invention uses a very stable reference voltage supply whose output is controlled by a voltage divider circuit to determine the input threshold switching voltage of each pad input circuit. Since the voltage divider can be manufactured more accurately, i.e. with less variation, than the transistors on the integrated circuit and because one reference voltage supply can set the threshold for the entire chip, this invention provides a pad input circuit with accurate and stable input switching characteristics. Additionally the FETs on the inputs of the circuits are matched such that their individual values may vary with the manufacturing process, but as long as they vary in the same proportion, then the switching accuracy and noise immunity will be maintained.
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Driscoll Benjamin D.
Martin Paul W.
NCR Corporation
Penrod Jack R.
Westin Edward P.
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