Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2009-05-18
2011-12-06
Chang, Joseph (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S1070DP, C331S1160FE, C331S1160FE, C331S154000, C331S160000
Reexamination Certificate
active
08072278
ABSTRACT:
An apparatus for generating an oscillating signal including a negative-resistance circuit, a crystal, and a component to modify a series resonance of the crystal to decrease power consumption of the negative-resistance circuit in generating the oscillating signal. The component may include a positive-reactance circuit, one or more inductive elements, or pair of inductive elements coupled to the crystal. The apparatus may further include a frequency-tuning component for adjusting a frequency of the oscillating signal, such as a variable capacitor coupled to the crystal. The negative-resistance circuit may include a digital inverter circuit, an inverting analog amplifier, or a self-regulating circuit. The apparatus may further include a quiescent current source to supply a steady-state current to the negative-resistance circuit, and a start up current source to supply a boost current to the negative-resistance circuit only during start up to expedite the oscillating signal in reaching a defined steady-state condition.
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International Search Report and Written Opinion—PCT/US2010/033681, International Search Authority—European Patent Office—Jan. 21, 2011.
Trimming the Crystal Frequency in: Robert Matthys: “Crystal Oscillator Circuits”, 1992, Krieger Publishing Company, Malabar, Florida, XP002614715, ISBN: 0-89464-552-8 pp. 101-102.
Garcia Jorge A.
Moyer Todd
Chang Joseph
QUALCOMM Incorporated
Shin Jeffrey
Vo Dang M.
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