Multi-range voltage controlled oscillator

Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means

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331 8, 331 17, H03L 700

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active

055594735

ABSTRACT:
A circuit design extending the range and linearizing the transfer characteristic of a fast voltage controlled oscillator (VCO). In addition, a multi-range VCO is described. Range extension is achieved by modifying the delay cell of a current controlled ring oscillator. The VCO transfer characteristic is linearized by piece-wise linear current control added to the delay cell. Additionally, a VCO capable of multi-range operation is provided. With the addition of multiple current sources which control booster inverter current, and by selectively enabling the additional current sources, a VCO with multiple frequency ranges can be achieved.

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