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US 2012/0068743 A1Published application
Feedback-Based Linearization of Voltage Controlled Oscillator
AssigneeBroadcom Corporation
InventorsMichael YOUSSEF, Ahmad MIRZAEI, Hooman DARABI
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Abstract
Embodiments of the present invention enable a feedback-based VCO linearization technique. Embodiments include a frequency locked loop formed by feeding back a VCO's output into the VCO's input in negative phase by means of a frequency-to-voltage (F/V) converter. Embodiments enable constant VCO gain over a wide input tuning range and across PVT variations. Further, embodiments can be nested within a PLL, for example, with negligible area and power consumption overhead.
Claims20
A phase-locked loop (PLL), comprising:
- a frequency locked loop (FLL) comprising:
- a voltage controlled oscillator (VCO) that receives a control voltage signal and that generates an output signal;
- a frequency-to-voltage (F/V) converter that receives the output signal and generates a feedback voltage signal;
- and
- a subtractor that receives a tuning voltage and the feedback voltage signal and generates the control voltage signal;
- a phase-frequency detector (PFD) that receives a reference signal and an input signal proportional to the output signal and that generates a phase error signal;
- and
- a filter that filters the phase error signal and generates the tuning voltage.
5 more elements
Dependencies are inferred from the claim text.