Digital-analog converter including a reduced number of resistors

Details Digital-analog converter including a reduced number of resistors Digital-analog converter including a reduced number of resistors

1991-10-15

1992-12-29

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341154, H03M 178

Patent

active

051755483

ABSTRACT:
A digital-analog converter according to the invention comprises a resistance circuit including a plurality of resistors connected in series, a switching circuit including a plurality of switching element disposed between the resistance circuit and an analog output terminal, a control-signal generating circuit for selectively turning on and off the switching elements, and a change-over circuit for switching the resistance circuit. The resistance circuit includes a first resistor having a resistance value of one half a unit resistance value and unit resistors of a unit resistance value and connected in series, the number of unit resistors provided being expressed by 2 to the (n-1)th power. The change-over circuit functions to connect resistors having a unit resistance value in parallel with selected unit resistors in the resistance circuit by means of changing switches which are selectively turned on and off by the control-signal generating circuit.

REFERENCES:
patent: 4647903 (1987-03-01), Ryu
patent: 5008676 (1991-04-01), Kanoh

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