Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2008-03-12
2009-10-13
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S144000
Reexamination Certificate
active
07602326
ABSTRACT:
An analog-to-digital converter has a resistor string that generates a series of voltages. An upper selector selects voltages at the upper end of the series. A lower selector selects voltages at the lower end of the series. A pair of midrange selectors select a pair of adjacent voltages in the middle range of the series. A midrange voltage generator generates further voltages spaced between the two selected midrange voltages. An output selector selects one of the further voltages. The selectors are controlled by various bits of a digital input signal. The voltage selected by the upper selector, lower selector, or output selector becomes an analog output signal. This analog-to-digital converter has comparatively few resistors and transistors and can generate accurate voltages for driving a gray-scale display.
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patent: 6556162 (2003-04-01), Brownlow et al.
patent: 6950045 (2005-09-01), Kim
patent: 7183962 (2007-02-01), Roo et al.
patent: 2002026732 (2002-01-01), None
Mai Lam T
Oki Semiconductor Co., Ltd.
Volentine & Whitt P.L.L.C.
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