Electricity: power supply or regulation systems – External or operator controlled – Using an impedance as the final control device
Patent
1991-06-11
1992-03-17
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using an impedance as the final control device
323298, 323367, 333 81R, G05F 163
Patent
active
050971972
ABSTRACT:
A signal level attenuating device having an analog attenuator and a digital attenuator which respectively include resistance attenuators. The resistance attenuators have the same attenuating characteristics and are mutually coupled. When one of the resistance attenuators is adjusted, the other of the resistance attenuators is simultaneously adjusted so that an analog signal and a digital signal respectively entered therein are attenuated at an identical attenuating factor. The digital attenuator further comprises an A/D convertor, a coefficient generator and a multiplier. The resistance attenuator in the digital attenuator attenuates a reference voltage and sends it to the A/D convertor. The coefficient generator computes an attenuation coefficient by which the digital signal entered therein is to be multiplied, based on an output of the A/D convertor. The digital signal is multiplied by the attenuation coefficient in the multiplier. The result of the multiplication is released as a digital output to an external device. The attenuation coefficient corresponds to the attenuating factor of the resistance attenuator of the analog attenuator. The digital signal and the analog signal are attenuated at an identical attenuating factor.
REFERENCES:
patent: 3525926 (1970-08-01), Maczka
patent: 3601718 (1971-08-01), Arnesen
patent: 3765020 (1973-10-01), Seager et al.
patent: 4415897 (1983-11-01), Kennedy
patent: 4644193 (1987-02-01), Ott
patent: 4683386 (1987-07-01), Kamikawara
patent: 4810949 (1989-03-01), Schiemenz et al.
Sharp Kabushiki Kaisha
Wong Peter S.
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