Patent ID: 6597247
Filing Date: 2003-07-22
Classification: H03C,H03D,H03L

Abstract:
Method adapted to transfer to a radio frequency transmission carrier the angle modulation of a carrier with a lower frequency (S4) used by a phase lock mesh (1), or PLL, as a modulated reference signal to generate said radio frequency transmission carrier (RF) by means of a voltage controlledoscillator (2) or VCO, a lock,band of the PLL (1) being susceptible of variations due to changed traffic requirements, thermic variations, ageing of the employed electronic devices, including the following steps:a) frequency conversion of the radio frequency transmission carrier generated by the VCO (S1) to a lower frequency; b) phase comparison between said radio frequency transmission carrier converted to a lower frequency (S3) and said modulated reference signal (S4) to obtain an error signal (S5) for the control of the VCO; characterised in that it comprises further the steps:c) detection of the peak value (S7) of said error signal (S5); d) generation of an adjustment signal (S8) of the lock band of said PLL (1) as the difference between said peak value (S7) and a predetermined reference value (VR); e) attenuation of the level of said error signal (S5) in relation to the value of said adjustment signal of the lock band (S8) of the PLL (1), maintaining in this way the relationship K between the lock band of the PLL (1) and bandwidth of said modulated reference signal (S4) constant.