Wide range frequency synthesizer with quadrature generation and spur cancellation
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United States of America Patent
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May 21, 2019
Grant Date -
Nov 16, 2017
app pub date -
May 25, 2017
filing date -
Apr 11, 2012
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Abstract
A frequency synthesizer generates a wide range of frequencies from a single oscillator while achieving good noise performance. A cascaded phase-locked loop (PLL) circuit includes a first PLL circuit with an LC voltage controlled oscillator (VCO) and a second PLL circuit with a ring VCO. A feedforward path from the first PLL circuit to the second PLL circuit provides means and signal path for cancellation of phase noise, thereby reducing or eliminating spur and quantization effects. The frequency synthesizer can directly generate in-phase and quadrature phase output signals. A split-tuned ring-based VCO is controlled via a phase error detection loop to reduce or eliminate phase error between the quadrature signals.
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