Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2006-08-29
2006-08-29
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C323S283000, C323S272000
Reexamination Certificate
active
07098728
ABSTRACT:
A method and circuit for compensating offset error caused by multiplexing in hysteretic control loops. An offset voltage, caused by one phase descending without being hysteretically controlled while another phase is being controlled, is determined by a sample-and-hold circuit that is arranged to track a low limit voltage Vloand a lowest voltage Vvalley. The offset voltage is one half of a difference between Vloand Vvalley. A timing and control circuit provides timing control voltages to the sample-and-hold circuit based on input signals associated with phase1and phase2. The sample-and-hold circuit provides Vloand Vvalleyto a differential amplifier that is arranged to provide the offset voltage to a hysteretic controller circuit. In one embodiment, the offset voltage is added to a reference voltage for corrected output voltage. In another embodiment, the offset voltage is added to the output voltage.
REFERENCES:
patent: 6853169 (2005-02-01), Burstein et al.
Gu et al, “A Multphase DC/DC Converter with Hysteretic Voltage Control and Current Sharing,” IEEE, APEC 2002, pp. 670-674.
Mei Tawen
Song Chunping
Branch John W.
Darby & Darby PC
National Semiconductor Corporation
Tra Quan
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