Variable attenuator for attenuating gain of analog signal in acc

Details Variable attenuator for attenuating gain of analog signal in acc Variable attenuator for attenuating gain of analog signal in acc

1993-07-27

1994-09-27

Lateef, Marvin M.

Electrical resistors

Plural resistance elements connected by a jumper or spacer

338320, 333 81R, H01C 722, H03H 725

Patent

active

053510305

ABSTRACT:
A variable attenuator has a plurality of attenuation resistor units, a plurality of switching units, and a plurality of impedance compensation resistor units. The attenuation resistor units are connected in series for attenuating an input signal, and the switching units are provided for the attenuation resistor units. One of the switching units are selected in accordance with a digital control signal supplied from an external source. Each of the impedance compensation resistor units is connected in series with the respective switching units to compensate an output impedance to a specific value regardless of the state of the switching units. Therefore, the variable attenuator of the present invention can correctly control the level of an analog signal by a digital signal.

REFERENCES:
patent: 3590366 (1971-06-01), Vaughn
patent: 3617959 (1971-11-01), Brander
patent: 3735264 (1973-05-01), Mauduech
patent: 3750044 (1973-07-01), Stanley

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