Two-stage high resolution digital-to-analog converter

Details Two-stage high resolution digital-to-analog converter Two-stage high resolution digital-to-analog converter

1984-02-17

1985-09-24

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

045435600

ABSTRACT:
A 16-bit D/A converter formed on a single monolithic IC chip and having two cascaded stages each including a 256-R resistor-string DAC. The first stage employs a switch selector system capable of selecting any two adjacent taps of the resistor string to produce a segment voltage to be applied across the second stage resistor string. The resistor strings are formed as elongate thin film strips configured as a single, unbent body having integral voltage tap nipples evenly-spaced along both sides of the strip. Buffer amplifiers between the cascaded stages incorporate NMOS and PMOS-cascoded bipolar current sources in a non-epitaxial structure on a P-type substrate.

REFERENCES:
patent: 3997892 (1976-12-01), Susset
patent: 4338591 (1982-07-01), Tuthill
patent: 4447747 (1984-05-01), La Potin
patent: 4491825 (1985-01-01), Tuthill
Hamade et al., "A Single Chip 8 Bit A/D Converter", 02/19/76, IEEE International Solid State Circuits Conference, Digest of Technical Papers, pp. 154-155.
Hamade, "A Single Chip All-MOS 8 Bit A/D Converter", Dec. 1978, IEEE Journal of Solid State Circuits, vol. SC-13, No. 6, pp. 785-791.

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