Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1994-06-17
1996-04-16
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341153, H03M 180
Patent
active
055087027
ABSTRACT:
A digital-to-analog conversion device that has one or more conversion cells, each cell coupled to a master voltage source and to a specific binary input element. The conversion cells include binary-weighted or binary-sized output transistors such that each output transistor, when called upon, delivers a unique analog output current corresponding to a particular binary signal. The master potential provided by a stable source is supplied to the control nodes of the output transistors so that the potential at those control nodes remains constant. Switching on and off of the output transistors is achieved by regulating the sources of those transistors rather than their gates. By regulating the operation of the output transistors at their sources, the present invention provides a digital-to-analog converter and a conversion method with little switching noise and minimal switching delay. The introduction of bipolar transistor devices to regulate the source and control nodes of the MOS output transistors utilizes the best characteristics of both transistor types to enhance converter monotonicity and linearity, in addition to reducing noise.
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Estrada Julio R.
Mentzer Ray A.
Bohan Thomas L.
Caseiro Chris A.
Hoff Marc S.
National Semiconductor Corp.
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