High-frequency Voltage Control Oscillator Circuit Composed of Transistor

Published:2011/9/8 1:49:00 Author:Sue | Keyword: High-frequency, Voltage Control, Oscillator, Transistor | From:SeekIC

The circuit shows the high-frequency voltage control oscillator circuit composed of transistor. In figure(a), C2 and C3 provide VT1's emitter and base electrode with positive feedback.The oscillation frequency's reactance set value is low, which is about a resistance value of hundreds of ohm, and the goal is to prevent VT1 parameter's change from influencing the resonance oscillation circuit. The resonance oscillation frequency will vary as L1 and variode VC1's capacitance vary. The oscillation output impedance conversion through C4, which can prevent it from being influenced by load variation.     In figure (b), L1's value can be determined by empirical method according to the oscillation frequency.



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