Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1992-12-07
1995-12-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327564, 327 77, 327535, 327434, H03K 301
Patent
active
054752736
ABSTRACT:
A smart power integrated circuit with dynamic isolation. A P-type isolation region surrounds the small signal devices (npn bipolar transistors and possibly other devices). This isolation region is held at ground in normal operation; but one or more pilot circuits continually monitor the collector voltages of the small-signal and power npn transistors, and instantly reconnect this isolation region, in real time, to the lowest collector voltage, whenever any of the collector voltages go below ground. Preferably a large capacitor provides a dedicated supply to the pilot circuit, so that the reconnection operation can proceed even when a power supply glitch occurs.
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Berta et al., "A simplified low-voltage smart power technology," 12 IEEE Electron Device Letters 465 (1991).
Paparo Mario
Zambrano Raffaele
Callahan Timothy P.
Lam T.
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