Circuit for the frequency multiplication of an angle modulated signal using a PLL and method

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United States of America Patent

PATENT NO 6597247
SERIAL NO

09831563

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Is disclosed a method and a relative circuit adapted to transfer to a microwave transmission carrier the angle modulation of an intermediate frequency signal. The conveyor of angle modulation is a PLL (100) which VCO (2) generates the microwave carrier (RF) modulated like the intermediate frequency signal (S4), taken as reference for the phase comparator (10) of the PLL. The comparator receives moreover a copy of the signal generated by the VCO, converted at intermediate frequency (S3) by means of a subharmonic mixer, and it generates an error signal (S5). The PLL comprises further a regulator circuit (101) which maintains automatically constant relation K between the locked band of the PLL and the bandwidth of the reference signal (S4), the lanter being a signal susceptible of band width variations, generally due to the choice of different transmission speeds. Regulator circuit (101) includes an error peak detector (102) and an operational amplifier (103) that compares the peak (S7) with a reference value (VR), obtaining from the difference a control signal (S8) of a variable attenuator (105) of the error signal (S5) which controls the VCO.

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Patent Owner(s)

Patent OwnerAddress
NOKIA SIEMENS NETWORKS ITALIA S P AVIA ROMA 108 CAP CASSINA DE PECCHI MI-20060

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Buoli, Carlo Mirandola, IT 9 62
Falasco, Gianluigi Muggio', IT 1 1
Micheli, Paolo Sesto San Giovanni, IT 1 1

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