Digital-to-analog and analog-to-digital converters using electri

Details Digital-to-analog and analog-to-digital converters using electri Digital-to-analog and analog-to-digital converters using electri

1993-03-30

1994-12-27

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341133, H03M 112, H03M 166

Patent

active

053769350

ABSTRACT:
A digital-to-analog converter includes a plurality of electrically programmable floating gate transistors, each having a electrically programmable threshold voltage. Each of the transistors has its source coupled to ground, its control gate coupled to an output node, and its drain coupled to the output node via one of a plurality of switching circuits. The output node is coupled to a voltage source via a load circuit. An input circuit decodes a digital input signal to selectively generate one of a plurality of control signals at a time in accordance with the digital input signal. Each of the control signals is for one of the switching circuits. When a transistor is coupled to the output node, the voltage level of the output node is equal to the threshold voltage of that transistor. An analog-to-digital converter includes a plurality of electrically programmable floating gate transistors, each having a electrically programmable threshold voltage. Each of the transistors has its source coupled to ground, its control gate coupled to an input analog voltage, and its drain coupled one of a plurality of output nodes. Each of the output nodes is coupled to the voltage source via its respective load circuit. The output circuit generates a digital output signal in accordance with the number of the transistors that are caused to be conducting by the input analog voltage.

REFERENCES:
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patent: 4293848 (1981-10-01), Cheng et al.
patent: 4398207 (1983-08-01), Hoff, Jr. et al.
patent: 5331323 (1994-07-01), Yamamoto
-A. Silburt, A. Boothroyd, and M. Elmasry, "A Novel Multiple Threshold MOSFET Structure for A/D and D/A Conversion," IEEE Journal of Solid-State Circuits, vol. SC-19, No. 5, pp. 794-801 (Oct. 1984).
-R. Walden, S. Schmitz, A. Kramer, L. Larson, and J. Pasiecznik, "A Deep-Submicrometer Analog-to-Digital Converter using Focused-Ion-Beam Implants," IEEE Journal of Solid-State Circuits, vol. 25, No. 2, pp. 562-570 (Apr. 1990).

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