Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2007-10-09
2007-10-09
Pascal, Robert (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S1160FE, C331S158000, C331S176000, C331S17700V, C331S185000
Reexamination Certificate
active
11340790
ABSTRACT:
With a variable capacitor including a load capacitor of an oscillation circuit having a feedback resistor1, an inverter2, and a crystal oscillator3, and a static capacitance generated between a drain terminal and a gate terminal of MOS transistors4and5, in which source and backgate terminals are shorted to each other, a serial connection of a DC cut capacitor9, 10and a variable capacitors (MOS transistor)4and5is formed between one end and the other end of the crystal oscillator3. For example, a threshold voltage control signal of the MOS transistors4and5is input to the drain terminal through a high-frequency elimination resistor11, 12, and is input to the source-backgate terminal through a high-frequency elimination resistor7, 8. In addition, a signal obtained by overlapping a temperature characteristic compensation signal and a threshold voltage control signal of the MOS transistor4, 5is input to the gate terminal. Accordingly, it is possible to indiscriminately determine an output bias of a temperature compensation control circuit or an external voltage frequency control circuit.
REFERENCES:
patent: 5764112 (1998-06-01), Bal et al.
patent: 6040744 (2000-03-01), Sakurai et al.
patent: 6628175 (2003-09-01), Guo et al.
patent: 2006/0071731 (2006-04-01), Tateyama
patent: 11-220329 (1999-08-01), None
patent: 2003-318417 (2003-11-01), None
Johnson Ryan J
McDermott Will & Emery LLP
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