| 摘要 |
<p>PURPOSE:To keep saw-tooth wave amplitude constant by supplying a synchronizing signal, whose peak value is within a fixed-value range, to the base of a transistor whose collector and emitter are connected to the collector and emitter of one transistor constitution a differential amplifier. CONSTITUTION:Transistor Trs Q1 and Q2 constitute a differential amplifier, current switch Q4 synchronizing with current switch Q3 is provided to the base of TrQ2, and a reference voltage generating circuit generates 1st and 2nd reference voltages by switch Q4. Here, switches Q3 and Q4 are controlled by the output of the differential amplifier to obtain a saw-tooth wave output from capacitor 20. Further, TrQ5 whose collector and emitter are connected to the collector and emitter of TrQ2 is provided and to the base of TrQ5, a synchronizing signal whose peak value is between the 1st and 2nd reference voltage is applied so as to alternate the charging and discharging of capacitor 20, thereby holding saw-tooth wave amplitude constant.</p> |
