Digital to analog converter with switching logic minimization

Details Digital to analog converter with switching logic minimization Digital to analog converter with switching logic minimization

1990-10-29

1991-11-12

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341136, 341154, H03M 176

Patent

active

050651595

ABSTRACT:
A plurality of resistors are connected between a source terminal to which a reference voltage is applied and a grounded terminal. A plurality of switches, which constitute a first switch group and derives voltages divided by the resistors, are respectively connected to the odd-numbered connection nodes among the connection nodes between the grounded terminal and a resistor and between each adjacent resistors. A plurality of switches, which constitute a second switch group and derives voltages divided by the resistors, are respectively connected to the even-numbered connection nodes among the connection nodes between the grounded terminal and a resistor and between each adjacent resistors. Each of the switches of the first and second switch groups is connected to a logical circuit serving as a decoder for selecting one of the switches in accordance with the content of bits other than the least significant bit of an input digital signal. The first and second switch groups are connected to a third switch group which selects the first or second switch in accordance with the content of the least significant bit of the digital signal.

REFERENCES:
patent: 4146882 (1979-03-01), Hoff, Jr. et al.
patent: 4352092 (1982-09-01), Masuda et al.
patent: 4462021 (1984-07-01), Watanabe et al.
patent: 4523180 (1985-06-01), Kuboki et al.
patent: 4667178 (1987-05-01), Ryu
patent: 4918448 (1990-04-01), Hauviller et al.
patent: 5014054 (1991-05-01), Oshita et al.

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