| 摘要 |
PURPOSE:To obtain a stable output signal against the fluctuation of an output DC voltage by providing a capacitor in place of a reference voltage generating circuit. CONSTITUTION:A capacitor 14 is provided between a common terminal 105 and a reference voltage terminal 106 being a common connection point between resistors 4 and 5. The voltage at the terminal 106 becomes a new reference voltage, which is entirely the same voltage as an output DC voltage of an amplifier 1. Further, the terminal 106 is an AC common point by the capacitor 14. Since the potential at the terminal 106 is entirely the same voltage as that at the terminal 106, even if the potential at the terminal 104 is fluctuated due to any cause, the potential at the terminal 106 is fluctuated the same voltage. Thus, the potential difference between the terminals 104 and 106 is always zero. Thus, the output voltage fluctuation at the terminal 104 due to the DC potential difference at the potential of the terminal 106 is not caused and a stable output signal is obtained. |
