| 摘要 |
A phase shifting circuit of the type comprising an operational amplifier with a capacitor in its negative feedback path and a resistor in series with its inverting input port is modified to provide adjustable phase shift. Adjustability is achieved by connecting a second capacitor in shunt with the resistor and, furthermore, a series-connected third capacitor and signal-inverting, controllable-gain amplifier also in shunt with the resistor.
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