Voltage controlled oscillator

Voltage controlled oscillator

The microwave VCO comprises two FETs (16,17) connected through capacitors (22a,22b) in a "ring" configuration and a microstrip line resonator (18). To the gate (G) of each of the field effect transistors a control voltage is applied for changing the gate-source capacitance, thereby obtaini...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BEYER, JAMES B, BOSCH, DONALD M, SWIRHUN, STANLEY E, CRAVENS, ROBERT L
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
MODULATION
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Beschreibung
Zusammenfassung:The microwave VCO comprises two FETs (16,17) connected through capacitors (22a,22b) in a "ring" configuration and a microstrip line resonator (18). To the gate (G) of each of the field effect transistors a control voltage is applied for changing the gate-source capacitance, thereby obtaining two isolated tuning controls which provide increased tuning bandwidth with reduced phase noise. The design uses a broadband active feedback topology resulting in greater device size for higher output power and circuit Q. The VCO was fabricated with both MESFET and HEMT device MMIC technologies and is used in a radar system.