| 摘要 |
PURPOSE:To facilitate external control over the extent of a phase shift over a wide range by regarding the difference between an input signal and a signal passed through an LCR resonating circuit and an amplifying circuit with a two- fold degree of amplification as an input signal. CONSTITUTION:An input signal voltage Vi is applied to the amplifier 2A with a two-fole degree of amplification through the parallel resonating circuit which consists of a resistance R, capacitor C, and inductance L and is grounded and a controller CN detects the difference between the input signal voltage Vi and the output voltage Vp of the amplifier 2A as an output voltage Vo. Through the Laplacean transform of the ratio of the input signal voltage Vi and output signal voltage Vo, Vo/Vi=(Vi-Vp)/Vi=(S<2>CLR-SL+R)/(S<2>CLR+SL+R); omegao is represented as 1/(CL)<1/2> and Q is represented as omegao to obtain a secondary phase shifting circuit. The resonance frequency omegao is freely controllable and the output signal is shifted in phase from the input signal. |
