| 摘要 |
PURPOSE:To give a stable frequency discriminating characteristics to the circuit without being subject to the change of ambient temperature and to avoid the presence of input pulse signal having a plurality of different periods, by using a monostable multivibrator which is possible for retriggering. CONSTITUTION:When a pulse signal A is fed to an input terminal 101, a monostable multivibrator 112 possible for retriggering is triggered, and a rectangular wave signal G having tau3 in pulse width is produced in synchronizing with the leading of the pulse signal A. That is, the time constant of the monostable multivibrator 112 is tau3. The signal G is fed to a pulse generator 113 to produce a negative pulse H which is in synchronizing with the leading of the signal G and has a given time width tau4, and it is input to an AND gate 114. A rectangular wave signal I which is delayed by the period tau4 of the signal H from the signal G is obtained at a gate 114. The signal I is fed to a trapezoid rectifier 115 to produce the trapezoid signal J. The signal J is fed to a sample hold circuit 117, it is sampled with the sampling pulse P in pulse-shape 116 from the input pulse signal A to produce the error voltage E through holding. |
