Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1997-07-25
1999-01-12
Young, Brian
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
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
Brubaker James Lee
Schrader Victor Paul
Linear Technology Corporation
Treyz G. Victor
Young Brian
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