Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

2007-01-31

2008-09-09

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S148000

Reexamination Certificate

active

07423572

ABSTRACT:
For example, in order to convert a 6-bit digital signal into an analog signal, a reference voltage generating circuit for generating 17 reference voltages, a first switch circuit having 19 switch pairs each including a MOS transistor for two reference voltages adjacent to each other in accordance with upper four bits, a second switch circuit including a series circuit of 12 MOS transistors and for dividing the difference between the two selected reference voltages using combined ON-resistances into four so as to obtain three intermediate voltages, and a third switch circuit for selectively outputting the lower voltage of the two selected reference voltages or one of the three intermediate voltages in accordance with lower two bits, are provided.

REFERENCES:
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patent: 5969657 (1999-10-01), Dempsey et al.
patent: 6373419 (2002-04-01), Nakao
patent: 7006027 (2006-02-01), Lan et al.
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patent: 2002/0033763 (2002-03-01), Nakao
patent: 2005/0285767 (2005-12-01), Wang et al.
patent: 2006/0001627 (2006-01-01), Murata
patent: 2006/0023001 (2006-02-01), Sung et al.
patent: 2007/0247343 (2007-10-01), Lan et al.

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