PURPOSE: To stabilize the sensitivity of the wave detection with no use of the compensating circuit or the like, by supplying both the reference pulse and the comparing pulse to the analog multiplying circuit and then giving a sample holding to the output of multiplication in the timing of the reference pulse.
CONSTITUTION: The common emitter of the transitors Q2 and Q3 to the collector of the transistor Q1 with the emitter connected to the reference potential terminal; and the common emitter of the transistors Q4 and Q5 is connected to the collector of the transistor Q3 respectively. Thus ananalog multiplying circuit with two stages of the differential amplifier is formed. Then the reference pulse e1 is applied to the base of the transistor Q5, and the comparing pulse e2 is applied to the base of Q3. And the output of multiplication is supplied to the sample-and-hold circuit 22 from the collector of Q5 via the buffer circuit 21. This circuit 22 receives the on/off control by the pulse e1, and this output is applied to the low pass filter 23. And the output of the filter 23 is utilized as the control voltage.
NAGAO NOBUYA
OGIWARA YUTAKA
