Integrated circuit D/A converter

Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices

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Details

341118, 341145, H03M 166, H03M 106

Patent

active

058445110

ABSTRACT:
A D/A converter implemented by an integrated circuit has a first section for conversion of higher-order N1 bits of an input digital signal to output a first current signal I.sub.1, a second section for conversion of lower-order N2 bits of the input digital signal to output a second current signal I.sub.2, a dividing section for dividing the second current signal to output a third current signal I.sub.2 .times.1/2.sup.N2, and an adding section for adding the first and third current signal. The D/A converter can be implemented by a reduced number of MOSFETs and has a reduced occupied area.

REFERENCES:
patent: 4594577 (1986-06-01), Mao
patent: 5001484 (1991-03-01), Weiss
patent: 5446455 (1995-08-01), Brooks
patent: 5451946 (1995-09-01), Smith et al.
Masarau Kokubo, et al., "A Fast-Frequency-Switching PLL Synthesizer LSI with a Numerical Phase Comparator", IEEE International Solid-State Circuits Conference, 260-261 (1995).
Peter H. Saul, et al., "Session II: Consumer ICs", An 8b CMOS Video DAC, IEEE International Solid-State Conference, 32-33 (1985).
Hiroyuki Igura, et al., "An area-saved PLL circuit with a digital loop filter", NEC System-ULSI Res. Lab., Microelectronics Res. Labs., NEC Corporation, 205 Mar. 1995.

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