| 摘要 |
PROBLEM TO BE SOLVED: To obtain an oscillation circuit which significantly reduces oscillation rise time and obtains an oscillation output just after start of oscillation. SOLUTION: A short-circuiting means 7 is placed in parallel as an input terminal voltage biasing means of an inverting amplifier 1 between its input and output terminals, and an output buffer circuit, which receives an output of the inverting amplifier 1 and performs oscillation output, always amplifies a minute-amplitude output of the inverting amplifier 1. At the time of start of oscillation, the inverting amplifier 1 is activated, a vibrator 5 is excited by applying potential difference to both ends of the vibrator 5, and thereafter the short-circuiting means 7 is operated in a predetermined period to establish a short circuit between the input and output terminals of the inverting amplifier 1. Thus, resonance-current peak in the vibrator 5 is increased and minute vibrations of the vibrator 5 are enhanced, and therefore the start of oscillation at an early stage can be achieved. COPYRIGHT: (C)2008,JPO&INPIT
|
