Mos-cascoded bipolar current sources in non-epitaxial structure

H - Electricity – 01 – L

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356/127

H01L 27/04 (2006.01) H01L 27/07 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1232366

ABSTRACT OF THE DISCLOSURE A 16-bit D/A converter formed on a single mono- lithic chip and having two cascaded stages each including a 256-R resistor string DAC. The analog output voltage of the first stage is coupled to the second stage by two buffer amplifiers each formed by a non-epitaxial process using a P-type substrate. The amplifiers include NMOS and PMOS-cascoded bipolar current sources arranged to avoid the use of metallization to provide for electrical interconnections within the source.

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