| 摘要 |
An attenuation network comprises a T or a pi network and first and second regulating circuits for controlling it. The T or pi network has at least two variable resistances. A switch S1 permits selection of a desired attenuation value which is set through the operation of the second regulating circuit on the T or pi network, while the first regulating circuit acts on the T or pi network such that its input and output resistances are kept constant.
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