Voltage generation circuit

Details Voltage generation circuit Voltage generation circuit

2011-03-15

2011-03-15

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Waveform generator coupled to display elements

C345S690000, C345S100000

Reexamination Certificate

active

07907136

ABSTRACT:
A voltage generation circuit includes a voltage divider circuit which generates first to Mth (M is an integer of two or more) divided voltages using a first power supply voltage and a second power supply voltage lower than the first power supply voltage and outputs the generated first to Mth divided voltages, and first to Mth impedance conversion circuits which perform impedance conversion of the first to Mth divided voltages, each of the first to Kth (K<M) impedance conversion circuits and the Lth (K<L<M) to Mth impedance conversion circuits including an operational amplifier of a first type, which is a rail-to-rail type, of which an operational range is set in a range between the first power supply voltage and the second power supply voltage, and each of the (K+1)th to (L−1)th impedance conversion circuits including an operational amplifier of a second type of which an operational range is set in a range between a third voltage which is lower than the first power supply voltage and a fourth voltage which is lower than the first power supply voltage and higher than the second power supply voltage.

REFERENCES:
patent: 6970152 (2005-11-01), Bell et al.
patent: 2005/0117402 (2005-06-01), Kim
patent: 2007/0257942 (2007-11-01), Kudo et al.
patent: A 2003-22063 (2003-01-01), None

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