Patent ID: 7847645

Claim:
An oscillation control apparatus, comprising: an oscillating unit oscillating an oscillating element; an output amplifying circuit having two pieces of same types of transistors series-connected to each other, and an output terminal for outputting a signal from a junction point between said two transistors in response to an oscillation signal outputted from the oscillating unit; a bias unit generating two DC bias voltages having different levels from each other, which are applied to either respective gates or respective bases of said two transistors; a constant voltage power supply unit applying a constant voltage to said oscillating unit; and an inverter unit provided between said oscillating unit and any one of either said gates or said bases of the two transistors, and inverting a phase of said oscillation signal outputted from said oscillating unit; wherein: the oscillation signal outputted from said oscillating unit and one of said two bias voltages are applied to either the gate or the base of one of said two transistors a, an oscillation signal outputted from said oscillating unit and whose phase has been inverted by said inverting unit and the other bias voltage of said two bias voltages are applied to either the gate or the base of the other transistor of said two transistors, and the two DC bias voltages are VG 1 and VG 2 which are represented by: VG 1 =VH+Vt−V REG pp/ 2, VG 2= VL+V REG pp/ 2, where VH is a maximum voltage of a signal output from the output amplifying circuit, VL is a minimum voltage of the signal output from the output amplifying circuit, Vt is a threshold voltage of the transistors, and VREGpp is peak-to-peak amplitude of voltage applied to the gate or the base.