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

H - Electricity

04

M

354/102, 356/30,

H04M 1/68 (2006.01) H03M 1/00 (2006.01) H04M 1/76 (2006.01)

Patent

CA 1234921

935.074 ABSTRACT OF THE DISCLOSURE A 16-bit D/A converter formed on a single mono- lithic IC chip and having two cascaded stages each includ- ing 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 cas- caded stages incorporate NMOS and PMOS-cascoded bipolar current sources in a non-epitaxial structure on a P-type substrate.

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