Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Patent
1998-06-08
2000-02-08
Lee, Benny
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
331176, H03L 700
Patent
active
06023198&
ABSTRACT:
A self-tuning VCO (116) receives a control voltage input (Vcont) (114) and an adjustable programmable voltage (Vadj) (122) and provides optimized locked conditions even under variations in temperature. A radio temperature is measured and stored (204) while Vadj (122) is initialized and stepped and Vcont (114) attempts to lock the VCO on frequency. Once a locked condition is achieved, the Vcont (114) is monitored to determine if it falls within a predetermined voltage range. If a non-optimized condition is detected, then the Vadj (122) is automatically adjusted until the VCO (116) becomes locked with a Vcont which falls within the predetermined voltage range. When a locked condition is achieved, the radio temperature is monitored and compared (212) to the original stored temperature (204). If a temperature threshold limit is reached (216) then the VCO is re-checks itself for a locked condition and re-optimizes itself to accommodate for the variations in temperature.
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Avanic Branko
Cruger Lorenzo
McKinney John K.
Choe Henry
Doutre Barbara R.
Lee Benny
Motorola Inc.
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