Electronic switch for decoupling capacitor

Details Electronic switch for decoupling capacitor Electronic switch for decoupling capacitor

1995-04-07

1996-04-09

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 98, 307 99, 324537, 324548, 3613062, H01H 8320

Patent

active

055064574

ABSTRACT:
An electronic switch circuit switches out bad decoupling capacitors on a high speed integrated circuit chip. The circuit comprises a control device that operates in the subthreshold or off device state to detect leakage in a decoupling capacitor. This control device operates in a low impedance state if the capacitor is good and in a high impedance sate if the capacitor is bad. A feedback circuit is connected from an internal node of the capacitor to a gate of the control device so that once a state of the capacitor is detected it can be stored on the gate of the control device. A single external signal source shared by a group of capacitors activates the control device to detect leakage in the capacitor. The circuit operates to switch out capacitors that fail during normal operation.

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patent: 4935836 (1990-06-01), Labbus et al.
patent: 5394294 (1995-02-01), Mei et al.
patent: 5436566 (1995-06-01), Thompson et al.

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