Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1976-02-25
1979-07-03
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03L 1303
Patent
active
041602447
ABSTRACT:
A digital-to-analog converter having a nonlinear transfer characteristic includes a voltage divider connected in parallel with a reference voltage and a switching array connected to the voltage divider. The switching array is actuated in accordance with the digital word which is being converted to an analog signal. The voltage divider is dimensioned to provide a nonlinear transfer characteristic. The digital-to-analog circuit is also employed for performing a successive approximation analog-to-digital conversion. The voltage divider is an integrated circuit resistor formed of an elongated strip of one polarity diffused in a semiconductor substrate of the opposite polarity, and some of the switches of the array are integrated circuit switches in which a portion of the continuous strip forms one terminal thereof.
REFERENCES:
patent: 3039030 (1962-06-01), Weidner
patent: 3573795 (1971-04-01), Bowers
patent: 3614327 (1971-10-01), Low
patent: 3662347 (1972-05-01), Fox
patent: 3705359 (1972-12-01), Kappes
patent: 3812478 (1974-05-01), Tomisawa
patent: 3890602 (1975-06-01), Tomisawa
patent: 3895378 (1975-07-01), Marcel
patent: 3997892 (1976-12-01), Susset
Paker "IEEE Transactions on Computers" vol. C-20 , No. 1, Jan. 1971, pp. 7-11.
Cecil James B.
Solomon James E.
Miller Charles D.
National Semiconductor Corporation
Woodward Gail W.
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