Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2007-03-20
2007-03-20
Lee, Benny (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C327S157000, C327S537000
Reexamination Certificate
active
10972407
ABSTRACT:
A local oscillator circuit has a control loop that locks the oscillation of a voltage-controlled oscillator at a programmable frequency. The control loop includes a voltage generator that generates a control voltage for the voltage-controlled oscillator, and a current generator that generates a current to raise and lower the control voltage. The magnitude of the current is switched according to the programmed frequency. The magnitude of the current can thereby be adjusted so that the local oscillator circuit achieves lock within a predetermined time, without the need for analog comparison of the control voltage.
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J. Craninckx, et al. “CMOS Wireless Frequency Synthesizer Design”, Kluwer Academic Publishers, pp. 212-217, 1998.
Lee Benny
Nixon & Peabody LLP
Oki Electric Industry Co. Ltd.
Studebaker Donald R.
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