| 摘要 |
PURPOSE:To maintain an oscillation synchronized with an input signal and at the same time to obtain the voltage proportional to the cycle of the input signal, by giving the sample holding with the input signal to the output voltage of an oscillator which produces a sawtooth wave having an inclination of a certain voltage. CONSTITUTION:A sawtooth wave output (g) which has an inclination of a certain voltage and the peak value decided by a control input (j) or controlled by the input (j) is added with a certain voltage E through a voltage adder 3 and produces an output pulse (h). This pulse (h) is sampled by a sample holding circuit 2 and held until the next sampling time point. Thus an output (j) is produced. Accordingly the output (j) has a change according to the change of the output (g) and when a signal (b) received the modulation of frequency by the original signal has a change. Thus the output (j) keeps its voltage although a sampling pulse (d) is not produced. |
