Adjustable current source and digital/analog converter with auto

Details Adjustable current source and digital/analog converter with auto Adjustable current source and digital/analog converter with auto

1988-09-20

1990-04-03

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341144, 3072961, 323226, H03M 166

Patent

active

049144405

ABSTRACT:
An adjustable current source comprising a bipolar transistor (BT), the base of which receives a signal adapted to approximately set the current which flows therethrough, and a MOS transistor (MT), in series with the bipolar transistor, the gate (G) of which receives an adjustment signal stored by a capacitor (C) connected between its gate and its drain. This current source can be used for forming the upper stages of an auto-calibration digital converter.

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H. P. von Ow, "Reducing Distortion in Controlled Attenuators Using FET" Procedings of the IEEE, 1968, pp. 1718, 1719.
"Operational Amplifier Design Techniques", Jacob Millman, Microelectronics, 1979, pp. 535-540.

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