Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2007-07-03
2007-07-03
Chang, Joseph (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S045000, C331S1170FE
Reexamination Certificate
active
11253732
ABSTRACT:
The oscillator includes: a first oscillator circuit in which first and second transistors cross-connected to each other are connected to a resonant circuit; and a second oscillator circuit in which third and fourth transistors cross-connected to each other are connected to a resonant circuit, wherein a coupling capacitor and coupling resistor are serially provided between a collector terminal of the first transistor and a base terminal of the fourth transistor, and a coupling capacitor and coupling resistor are serially provided between a collector terminal of the second transistor and a base terminal of the third transistor, and a coupling capacitor and coupling resistor are serially provided between a collector terminal of the third transistor and a base terminal of the first transistor, and a coupling capacitor and coupling resistor are serially provided between a collector terminal of the fourth transistor and a base terminal of the second transistor. On this account, it is possible to suppress noises and reduce power consumption.
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J. van der Tang et al., “Analysis and design of an optimally coupled 5-GHz quadrature LC oscillator,” IEEE journal of Solid-State Circuits, vol. 37, No. 5, May 2002, pp. 657-661.
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Chang Joseph
Harness & Dickey & Pierce P.L.C.
Sharp Kabushiki Kaisha
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