VCO WITH LINEAR GAIN OVER A VERY WIDE TUNING RANGE

VCO WITH LINEAR GAIN OVER A VERY WIDE TUNING RANGE

An oscillating circuit with linear gain is presented. The oscillating circuit may include a relaxation oscillator and a current compensation block. The relaxation oscillator includes a capacitor, a pair of resistors operative to deliver a first current to the capacitor, and a first current source ad...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GALTON, Ian, SWAMINATHAN, Ashok
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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
PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:An oscillating circuit with linear gain is presented. The oscillating circuit may include a relaxation oscillator and a current compensation block. The relaxation oscillator includes a capacitor, a pair of resistors operative to deliver a first current to the capacitor, and a first current source adapted to generate the first current having a first predefined level. The current compensation block includes a second current source, and a pair of cross-coupled transistors coupled to the second current source and adapted to steer a current exceeding the first predefined level in the relaxation oscillator away from the capacitor and to the second current source. The proposed oscillating circuit generates an output signal which has a linear gain over a wide tuning range.