| 摘要 |
PURPOSE:To completely suppress the phase fluctuation of an output signal by connecting a parallel circuit comprising a resistor and a capacitor to each emitter of a differential pair transistor (TR) and using a variable capacitor as the capacitor. CONSTITUTION:Junction capaitors 17, 18 are used as variable capacitors. The capacitance of the junction capacitors 17, 18 changes depending on a reverse bias voltage. A voltage drop appearing across the resistors 3, 4 is used as a reverse bias voltage device. The voltage drop is changed freely by varying the current flowing to the resistors 3, 4. Thus, a constant current source 41 whose constant current is varied is used as the constant current source, a constant current I' to obtain an optimum capacitance is searched and the current is fixed to the value I'. |
