Digital/analog (D/A) converting device with unit current generat

Details Digital/analog (D/A) converting device with unit current generat Digital/analog (D/A) converting device with unit current generat

1995-12-22

1997-12-09

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341136, H03M 166

Patent

active

056965125

ABSTRACT:
The D/A converting device disclosed includes a decoder, and a plurality of unit current generating circuits each having a differential switching circuit and a reference voltage generating circuit. The decoder receives a digital input value of n bits and outputs a plurality of complementary pairs of digital signals corresponding to the n bits of the digital input value. Each unit current generating circuit receives a complementary pair of digital signals from the decoder. The differential switching circuit has two complementary current output terminals, a bias voltage input and a reference voltage input. The two complementary current output terminals of the differential switching circuit are interconnected between corresponding ones of the unit current generating circuits with the interconnected points being made two complementary analog output terminals. Each of the analog output terminals and a power source terminal are connected to a load circuit, whereby analog output voltages corresponding to the digital signals inputted to digital input terminals of the n bits are obtained at the analog output terminals. This enables the speeding up of a settling time by reducing overshoot and undershoot when the analog output full-swings.

REFERENCES:
patent: 5361068 (1994-11-01), Llewellyn

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