Electricity: power supply or regulation systems – External or operator controlled – Using an impedance as the final control device
Patent
1993-02-24
1994-08-16
Voeltz, Emanuel T.
Electricity: power supply or regulation systems
External or operator controlled
Using an impedance as the final control device
333 81R, H03H 726
Patent
active
053390210
ABSTRACT:
A voltage attenuation network includes one or more cascaded resistor ladder stages, with decremented voltage taps provided at successive cascaded steps within each stage. Each stage includes a termination step having a resistance value Ri equal to the stage input impedance, series step resistors with resistance values Ri(1-A)/A and shunt step resistors with resistance values Ri/(1-A), where A is a step-to-step voltage attenuation factor. The input resistances of each step within a given stage are substantially equal, eliminating the need for output buffers at the step taps. A pair of switches are provided for each step, including an output switch connected between the step input node and a common output line, and a shunt switch connected in series with the shunt resistor for that step. Only one output switch is closed at a time, and only the corresponding shunt switch for the same step is opened. Multiple stages can be cascaded to provide a progressively finer voltage decremention, with the input impedance for each stage equal to the shunt resistance values for the preceding stage.
REFERENCES:
patent: 4467286 (1984-08-01), Stitt
patent: 4468607 (1984-08-01), Tanaka et al.
patent: 4990868 (1991-02-01), Barbour
Toshiba Integrated Circuit Technical Data, TC9212P, TC9213P.
Precision Monolithics, Inc. Analog Integrated Circuits Data Book, vol. 10, 1990, pp. 11-260.
Grebene, Bipolar and MOS Analog Integrated Circuit Design, John Wiley & Sons, 1984, pp. 758-760 and 773-777.
Analog Devices Inc.
Voeltz Emanuel T.
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