Interpolation circuit for digital-to-analog converter

Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion

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341150, H03M 166

Patent

active

058596062

ABSTRACT:
A voltage interpolation circuit for a digital-to-analog converter comprises a differential amplifier with composite input devices, each of which is composed of multiple active subtransistors. Interpolation is effected between a first voltage and a second voltage by selectively connecting the gates of the active subtransistors in one of the composite devices to either the first voltage or the second voltage. Each active subtransistor operates in conjunction with a voltage-controlled degeneration subtransistor to form a functional subtransistor pair. Using the nonlinear conductance characteristic of MOS devices operated in the triode region, the transconductance of each functional subtransistor pair is modulated in such a way as to be made relatively insensitive to changes in effective gate-to-source voltage V.sub.GS ', so that the interpolation circuit produces equally sized interpolated voltage steps at an analog output.

REFERENCES:
patent: 5235334 (1993-08-01), Manvar et al.
patent: 5313205 (1994-05-01), Wilson
patent: 5396245 (1995-03-01), Rempfer

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