Device for Compensating Temperature Drift of a VCO, and to a Method Thereof

摘要

A device for compensating temperature drift of a voltage controlled oscillator (VCO) is provided. The VCO has at least one varactor arranged for controlling an output frequency fOut of said VCO by applying a tuning voltage VTune and simultaneously applying a bias voltage VBias on a cathode and an anode of said at least one varactor, respectively. Said device comprises a monitoring circuit and a tuning circuit. Said monitoring circuit has an input arranged to receive said VTune and is arranged to monitor said VTune and further is arranged to activate said tuning circuit based on a value of said VTune, and said tuning circuit has an output connected to said anode and is arranged to output said VBias, wherein said tuning circuit further is arranged to tune said VCO by changing said VBias so as to compensate for a temperature drift of said VCO.

主权项

1. A device for compensating temperature drift of a voltage controlled oscillator (VCO) in a phased locked loop (PLL), said VCO having at least one varactor arranged for controlling an output frequency fOut of said VCO by applying a tuning voltage VTune and simultaneously applying a bias voltage VBias on a cathode and an anode of said at least one varactor, respectively, wherein said device comprises:
a monitoring circuit; and a tuning circuit, wherein said monitoring circuit has an input arranged to receive said tuning voltage VTune and is arranged to monitor said tuning voltage VTune and further is arranged to activate said tuning circuit based on a value of said tuning voltage VTune, wherein said tuning circuit has an output connected to said anode and is arranged to output said bias voltage VBias, and wherein said tuning circuit further is arranged to tune said VCO by changing said bias voltage VBias to compensate for a temperature drift of said VCO.