| 摘要 |
PURPOSE:To enable to obtain a pi/2 phase shift circuit having good frequency characteristics, by giving an input signal to a differentiating circuit and an integrating circuit after branch and weighting these outputs after weighting with a suitable value. CONSTITUTION:An input Vi is branched and given to a differentiating circuit 1 and an integration circuit 2. The output A of the circuit 1 and the output B of the circuit 2 via an inversion circuit 3 are given to an addition circuit 4. The circuit 4 gives (m) times weight on the input A and (n) times weight on the input B and the output has the addition signal of Vo=mA+nB. Thus, an output proportional to the frequency is obtained from the circuit 1, the output inversely proportional to the frequency is obtained from the circuit 2, and pi/2 phase shift circuit having good frequency characteristics can be obtained by weighting and addition of the outputs of the both suitably. |
