Boots – shoes – and leggings
Patent
1994-03-14
1995-10-24
Mai, Tan V.
Boots, shoes, and leggings
364607, G06G 716, G06J 100
Patent
active
054615836
ABSTRACT:
A programmable frequency sine wave signal generator, including a generator for generating square-wave signals having a programmable frequency; a counter for counting the periods of the square-wave signals; circuits for providing successive discrete sine wave values from successive states of the counter; and a low-pass filter receiving the successive discrete sine wave values and providing the sine wave. The low-pass filter is a switched-capacitor filter with a switching mode that is controlled by a signal having a frequency proportional to the frequency of the square-wave signal. Correct selection of the values of the filter capacitors allows the cut-off frequency of the filter to be continuously substantially the same as the frequency of the sine wave.
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Electronics Letters, vol. 22, No. 12, 1986, Stevenage GB, pp. 635-636, "Sine-Wave Generation Using A High-Order Lowpass Switched Capacitor Filter".
Fensch Thierry
Mazoyer Yves
Mai Tan V.
SGS-Thomson Microelectronics S.A.
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