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14/03/2019 1 MWO Design of a Colpitts oscillator R L = 1K f 0 = 1MHz Vp = 10V
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MWO Design of a Colpittsoscillator
RL = 1Kf0 = 1MHzVp = 10V
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The quality factor of the circuit is Q = 1.1/0.06 18
Circuit without load (…bis)
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• The resistors for base biasing are found from a startingvalue for Vbe equal to 0.6V. Then, they are adjusted to get Ic = 1 mA (DRAW Add Annotation DCIA e DCVA_Nto see the bias point)
• Inductance L is chosen so that its reactance is greaterthan 50 times the load resistance
• Coupling capacitors are chosen so that their reactanceis lower than 1 Ω at oscillation frequency
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