Low impedance switched attenuator

Details Low impedance switched attenuator Low impedance switched attenuator

1986-09-17

1987-08-04

Beha, Jr., William H.

Electricity: power supply or regulation systems

External or operator controlled

Using an impedance as the final control device

333 81R, 338201, H03H 500, H01C 1050

Patent

active

046848819

ABSTRACT:
A switched attenuator circuit providing three selectable voltage-divider ratios including one which passes substantially 100 percent of the input signal. The circuit places constant load resistance on its source in all positions when driving a high-resistance load. The circuit is inexpensive to construct, comprising three attenuation resistors, two input resistance compensating resistors, and two single-pole double-throw switching elements for changing the series/parallel configuration of the attenuation resistors and switching the compensating resistors into the circuit. The circuit places all parasitic capacitance associated with the switches on the input side of the circuit, thereby providing uniformly low output capacitance for all voltage-divider ratios.

REFERENCES:
patent: 3403324 (1968-09-01), Bradley
patent: 3519930 (1970-07-01), Bradley
patent: 3898593 (1975-08-01), Qureshi

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