Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1988-03-03
1989-06-06
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, 377 42, H03M 182
Patent
active
048375730
ABSTRACT:
A circuit and method for converting a binary number having a plurarity of bits, D.sub.o to D.sub.n, to a signal having a proportionally equivalent characteristic. The circuit comprises a parallel input for receiving each bit, D.sub.o to D.sub.n, of the binary number and means for generating a plurarity of wavetrains, W.sub.o to W.sub.n, having frequencies decreasing by powers of two from the least significant wavetrain, W.sub.o, to the most significant wavetrain, W.sub.n. Each wavetrain comprises pulses having a pulse width equal to the inverse of twice the frequence of the least significant wavetrain, W.sub.o, so that the duty cycle of each of the wavetrains is proportional to the corresponding frequency thereof. The pulses of each of the wavetrains are not overlapping with the pulses of the other wavetrains. The circuit also comprises logic means, connected to the input and the generating means, for logically multiplying each wavetrain taken in an order from the least significant to the most significant, W.sub.o to W.sub.n, by a corresponding bit of the binary number taken in reverse order from the most significant to the least significant, D.sub.n to D.sub.o, and logically summing all of the products of each, the sum thereof being a composite waveform. Thus, the composite waveform has a duty cycle proportionally equivalent to the binary number.
REFERENCES:
patent: 3942171 (1976-03-01), Haraszti et al.
patent: 4389637 (1983-06-01), Rzeszewski
Berneike Richard H.
Process Automation Business Inc.
Shoop Jr. William M.
Young Brian
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