Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By phase
Patent
1995-03-06
1996-01-09
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By phase
327333, 327 67, 327 72, 363 59, 363 62, H03K 522
Patent
active
054831822
ABSTRACT:
A reference current source (38) and a matched reference transistor (40) are provided as part of a current limiting circuit, wherein the matched reference transistor (40) is scaled, electrically matched, and physically located in close proximity to an on-chip switching transistor (16) of a DC--DC converter. By serially coupling the reference current source (38) to the reference transistor (40), a reference signal (48), which is equal to the voltage across the reference transistor (40), is generated. The reference signal (48) is compared to the voltage across the switching transistor (16) while the switching transistor (16) is conducting. When the voltage across the switching transistor (16) exceeds that across reference transistor (40), the gate drive to the switching transistor (16) is disabled for the remainder of the current conductive phase.
REFERENCES:
patent: 5343034 (1994-08-01), Sato
D. Vargha; "Squeeze More Working Hours From Battery-Powered PCs;" Electronic Design--PC Design Special Editorial Feature; (Oct. 15, 1992).
Markison Timothy W.
Motorola Inc.
Wambach Margaret Rose
Witek Keith E.
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