Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1993-10-12
1996-01-16
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341144, H03M 166
Patent
active
054851530
ABSTRACT:
A sinusoidal wave generation apparatus comprising a pulse generator for generating a pulse signal of a precise frequency in response to a clock signal from an oscillator, a frequency divider for dividing the precise frequency of the pulse signal from the pulse generator by a desired ratio to output a desired frequency of pulse signal, an up/down counter for alternately up-counting and down-counting the frequency-divided pulse signal from the frequency divider and outputting up/down-counted values corresponding to digital triangular wave data, a digital/analog converter for converting the digital triangular wave data of the up/down-counted values from the up/down counter into an analog triangular wave signal, a low pass filter for filtering a harmonic component of the analog triangular wave signal from the digital/analog converter to output a sinusoidal wave signal, a comparison circuit for comparing the up/down-counted values from the up/down counter with predetermined upper and lower reference values, respectively, and outputting pulse signals in accordance with the compared results, and a latch unit for changing the up-counting operation of the up/down counter to the down-counting operation thereof and vice versa in response to the pulse signals from the comparison circuit.
REFERENCES:
patent: 3689914 (1972-09-01), Butler
patent: 4296407 (1981-10-01), Minakuchi
patent: 4782324 (1988-11-01), Underwood
patent: 5146224 (1992-09-01), Kitayoshi
Analog-Digital Conversion Handbook, Analog Devices, Inc. (Daniel Sheingold, Ed.), 1986, pp. 124-127.
Hoff Marc S.
Samsung Electronics Co,. Ltd.
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