Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2008-06-18
2011-12-20
Laxton, Gary L (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S222000, C323S284000
Reexamination Certificate
active
08080988
ABSTRACT:
A driver circuit (for example, in a switching power supply or in a Class-D switching amplifier) drives a gate of a switch during a transition with a low output impedance during an initial period and then for the remainder of the transition drives the gate with a midrange output impedance. The switch in turn switches current flow through an inductor. The driver circuit includes a “Drive Node Voltage Dependent Impedance Circuit” (DNVDIC) that couples the gate to a supply voltage node. In one embodiment, there are two resistive current paths through the DNVDIC. A non-linear device in the first current path switches from having a small to a large impedance when a voltage drop across the device falls below a threshold voltage. The resulting increase in impedance of the first current path decreases voltage edge rates and reduces noise, whereas the low initial impedance reduces transition power losses.
REFERENCES:
patent: 3619658 (1971-11-01), Prunty
patent: 6429701 (2002-08-01), Karaki et al.
patent: 7199646 (2007-04-01), Zupcau et al.
patent: 7688049 (2010-03-01), Iwabuchi et al.
Hue Trinh Khac
Hurtz Gary Michael
Kunst David J.
Active-Semi, Inc.
Imperium Patent Works
Laxton Gary L
Wallace Darien K.
Wallace T. Lester
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