High frequency RF driver

A device for providing an RF signal burst to an external load (12) includes a voltage-controlled oscillator (14) to generate a drive signal having a frequency fVCO fixed by an oscillator control signal. An RF driver stage (10) coupled to the external load receives the drive signal and generates an R...

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Bibliographische Detailangaben
Hauptverfasser:	BAKER, KEITH W, THEODOULOU, SOTOS M, VANNERSON, ERIC F
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY GENERATION GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	A device for providing an RF signal burst to an external load (12) includes a voltage-controlled oscillator (14) to generate a drive signal having a frequency fVCO fixed by an oscillator control signal. An RF driver stage (10) coupled to the external load receives the drive signal and generates an RF signal burst in response to the drive signal. A current transformer (38) coupled between the RF driver stage and the external load senses the current in the RF driver stage and generates a reference current having the same phase as the sensed current. A phase detector (30) receives the reference current along with the drive signal and generates a phase detection signal that provides a measure of the phase of the current in the RF driver stage with respect to the drive signal. The phase detection signal can be used to adjust the oscillator control signal to drive the oscillator frequency to a desired value.