Oscillators – L-c type oscillators
Reexamination Certificate
2008-03-14
2010-06-22
Chang, Joseph (Department: 2817)
Oscillators
L-c type oscillators
C331S057000, C331S172000, C327S117000
Reexamination Certificate
active
07741923
ABSTRACT:
A transistor voltage-controlled oscillator (VCO) and a frequency synthesizer having the transistor VCO are provided. The frequency synthesizer adopts a divide-by-five injection-locked frequency divider, which includes a five-stage inverter ring oscillating frequency dividing circuit for reducing the operating frequency of the oscillating signal from the VCO, thus decreasing power consumption due to counting operation of the frequency synthesizer. The transistor VCO includes three transistor switching capacitor sets connected in parallel to one another to form a parallel structure. The gates of the transistor switching capacitor sets are connected to respective operating voltage sources, so as to switch the status of the corresponding transistor switching capacitor set, which in turn adjusts the harmonic frequency generated by the VCO, thereby allowing the VCO to generate a corresponding operating frequency with enough bandwidth.
REFERENCES:
patent: 7102454 (2006-09-01), Sze et al.
patent: 2005/0174184 (2005-08-01), Wu
patent: 2008/0007365 (2008-01-01), Venuti et al.
patent: 2008/0197933 (2008-08-01), Zhang et al.
Deng Ping-Yuan
Kiang Jean-Fu
Chang Joseph
National Taiwan University
Pearne & Gordon LLP
Shin Jeffrey
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