Patent
Temperature compensation for a variable frequency oscillator without reducing pull range
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TLDR
In this article, the tuning sub-circuits are connected in parallel with each other and with a resonator module, which may be a quartz crystal, inductor, or other reactance component.Abstract:
A variable frequency oscillator having multiple, independent frequency control inputs, each coupled to a respective tuning sub-circuit. The tuning sub-circuits are connected in parallel with each other and with a resonator module, which may be a quartz crystal, inductor, or other reactance component. Each tuning sub-circuit consists of two varactors with their respective cathodes coupled to each other and to their corresponding frequency control input. By having the tuning sub-circuits connected in parallel to the resonator, the overall frequency pull range of each frequency control input remains unaffected by the activation of any other frequency control input. Preferably, at least one frequency control input is a temperature compensation control input that can maintain the variable oscillator insensitive to temperature variations while the remaining frequency control inputs provide functional frequency control.read more
Citations
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References
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Frequency synthesizer with temperature compensation and frequency multiplication and method of providing the same
TL;DR: In this article, a frequency synthesizer with temperature compensation and frequency multiplication is presented, where the temperature is compensated by a multi-modulus divider and the multiplicative factor of the multiplication factor is a function of the temperature.
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