| 摘要 |
PURPOSE:To select an optimum capacitance and stable oscillation at each oscillating frequency even when the oscillating frequency of a piezoelectric vibrator by placing a pad of a capacitive cell formed in a semiconductor element oscillating electrically the piezoelectric vibrator between two electrode pads connecting to the piezoelectric vibrator. CONSTITUTION:Respective pads 10, 11 of capacitors 6, 7 are placed between two pads 8, 9 of an oscillation circuit formed in a semiconductor element 20. Since the capacitors 8, 7 are able to be connected to a gate lead terminal 23 and a drain lead terminal 24 as required with wire bonding connection or the like by an Au wire 22 electrically, the capacitance at the gate and drain sides of the oscillating circuit formed in the inside of the semiconductor element 20 is varied optionally. Thus, the capacitance of the oscillating circuit in the semiconductor element is set to the optimum capacitance of the oscillating circuit at each oscillating frequency when the oscillating frequency of the piezoelectric vibrator is varied to attain stable oscillation.
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