Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1993-11-12
1996-11-19
Pascal, Robert
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331176, 331 16, 331 66, 327105, 327106, H03L 718, H03L 708
Patent
active
055766668
ABSTRACT:
A fractional-N frequency synthesizer which incorporates division by a fractional value. Division is by a first value during first cycles and by a second value during second cycles. During the first cycles, an error in value accumulates, and when it reaches a certain value, causes a change in the dividing ratio to reduce the error value. The increase and decrease in error causes spurs in the output frequency spectrum. These spurs are cancelled using a cancellation network. The gain of the phase detector is temperature-compensated and the gain of the spur cancellation network is not, but the temperature compensation of the phase detector gain causes compensation of both values.
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Mason, K., IC s for Communication "Designer Guide to Frequency Synthesis using the UMA1000", Report No.: SCO/AN92002, Product Concept & Application Laboratory Southampton, England, Philips Semiconductors Application Note, pp. 1-59.
Kinkead Arnold
Nippondenso Technical Center USA, Inc.
Pascal Robert
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