Electricity: power supply or regulation systems – External or operator controlled – Using an impedance as the final control device
Patent
1982-05-04
1984-08-28
Wong, Peter S.
Electricity: power supply or regulation systems
External or operator controlled
Using an impedance as the final control device
333 81R, 455249, 340347DA, H03H 726, H03K 1302
Patent
active
044686072
ABSTRACT:
A ladder-type signal attenuator comprises a ladder network (50) storing a ladder resistor circuit of a plurality of stages (n-1) each having an input resistor (2R) and an output resistor (R) and a ladder portion of the final stage (n) having an input resistor (8) and an output resistor (7) and coupled to the ladder resistor circuit. The resistance value (RB) of the input resistor (8) of the ladder portion of the final stage is different from 2R and/or the resistance value (RA) of the output resistor (7) is different from R. A bias voltage (Vb) or an analog input signal (Sin) is selectively applied to a corresponding signal input terminal of the ladder circuit (50) by means of switches (S.sub.1 to S.sub.n) in response to control data (b.sub.1 to b.sub.n) of n bits. At least one of the resistance values of the two resistors (7, 8) of the final stage ladder portion is changed as a function of the state "0" or "1" of the final bit (b.sub.n ) of the control data, whereby the ratio of the output to the input of the ladder-type signal attenuator with respect to the control data is approximated in a polygonal line manner to a desired curve.
REFERENCES:
patent: 3590366 (1971-06-01), Vaughn
patent: 3728719 (1973-04-01), Fish
patent: 3858128 (1974-12-01), Mullin
patent: 3898593 (1975-08-01), Qureshi
patent: 4150366 (1979-04-01), Price
patent: 4349811 (1982-09-01), Brokaw
patent: 4381499 (1983-04-01), Struthoff
Tanaka Kouji
Yamada Susumu
Sanyo Electric Co,. Ltd.
Tokyo Sanyo Electric Co. Ltd.
Wong Peter S.
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