Boots – shoes – and leggings
Patent
1984-04-27
1986-12-23
Smith, Jerry
Boots, shoes, and leggings
364607, 364851, G06F 102
Patent
active
046316949
ABSTRACT:
A sine wave synthesizer is employed in an analog signal processing integrated circuit. The circuit includes an integrator driven from a plurality of integration constant capacitors which are sequentially selected by a clocked decoder. Each capacitor is selected by coupling it between the integrator and a switched reference source. The capacitors are selected so that their sequential selection produces a sine wave approximating current in four increments. A first increment of a sine wave is produced according to an ascending selection of integration constant capacitors. Thereafter, the capacitors are selected in reverse in a descending manner to produce a second increment of the sine wave. The switched capacitor phasing circuit is then operated to invert the sine wave signal to produce the third and fourth increments having a negative instead of a positive excursion. The frequency of the sine wave is controlled by the decoder clock input. An output filter stage converts the digitally produced sine wave increments into a smooth sine wave output. This filter is provided with selectable time constants to allow operation at different selected frequencies.
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Meyer Charles B.
National Semiconductor Corporation
Smith Jerry
Winters Paul J.
Woodward Gail W.
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