Low impedance switch attenuator

Details Low impedance switch attenuator Low impedance switch attenuator

H - Electricity

03

H

333/86

H03H 7/24 (2006.01) G01R 1/20 (2006.01)

Patent

CA 1270912

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 resis- tance on its source in all positions when driving a high-resistance load. The circuit is inexpensive to construct, comprising three attenuation resis- tors, 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 compen- sating 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.

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