| 摘要 |
PURPOSE:To decrease the number of terminals and to attain ease of amplitude limit control by adding an amplitude control voltage generating circuit using a differential circuit and generating two bipolar control voltages. CONSTITUTION:A signal inputted from an input terminal 101 is fed to the 1st differential circuit 20 comprising npn transistors (TR) 131, 132 and a signal as a result of level shift to an input signal waveform in terms of DC is fed to a base of a TR107 in the amplitude limit circuit main body 50 by the level shift operation. On the other hand, a base potential of the TR133 being a component of a differential circuit 30 comprising npn TRs 133, 134 is changed by changing an externally mounted variable resistor 136, and a current flowing to the TRs 133, 134 is controlled so as to decide optionally a base potential of TRs 108, 111 applying the amplitude limit operation. |
