| 摘要 |
A voltage controlled filter with a plurality of cascaded phase shift circuit stages in a negative feedback path of an amplifier. Each phase shift circuit stage is a RC phase shift network which includes a series capacitor and a field effect transistor (FET) with its source-drain circuit connected as a shunt to ground. The magnitude of the effective source-drain resistance of the FET in each stage is controlled by a DC control voltage which is applied in common to the gate of each FET.
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