Voltage generating circuit with two resistor ladders

Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Converging with plural inputs and single output

Reexamination Certificate

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Details

C327S534000

Reexamination Certificate

active

07053690

ABSTRACT:
A voltage generating circuit that drives multiple output terminals in alternating positive and negative cycles has two resistor ladders, one resistor ladder generating voltages for the positive cycles, the other resistor ladder generating voltages for the negative cycles. Single-ended amplifiers are connected directly to the resistor ladders, and a switching circuit connects each output terminal to a selectable one of the amplifiers. The output terminals may be precharged to opposite potentials at the beginning of positive and negative cycles, and the resistor ladders may include switching elements that initially set all generated voltages to these potentials so that the amplifiers start each cycle with equal input and output levels, reducing overshoot and undershoot. This voltage generating circuit saves space and power in driving, for example, a display panel in a mobile telephone.

REFERENCES:
patent: 6570560 (2003-05-01), Hashimoto
patent: 2002/0175904 (2002-11-01), Matsumoto
patent: 2003/0006979 (2003-01-01), Tsuchi et al.
patent: 2002-353792 (2002-12-01), None
patent: 2003-022056 (2003-01-01), None

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