OSCILLATOR TYPE
Wien Bridge
Phase Shift
Colpitts
Hartley
WIEN BRIDGE OSCILLATOR
RESULTS
Wien Bridge Oscillator
Uses an RC Wien network as the frequency-selective feedback path and an op-amp with
a non-inverting gain stage. Oscillation occurs when the loop gain equals unity at the resonant frequency.
The feedback fraction B = 1/3 at resonance, so the amplifier gain must be exactly 3.
RC Phase Shift Oscillator
Three cascaded RC high-pass sections each contribute 60° of phase shift for a total
of 180°, completing the inversion needed for positive feedback. The minimum closed-loop gain
required is 29, making Rf = 29·R a key design constraint.
Colpitts Oscillator
Uses an LC tank circuit with two series capacitors (C1, C2) and a single inductor.
The capacitive voltage divider sets the feedback fraction B = C1/C2.
Widely used in RF circuits up to several hundred MHz due to its excellent frequency stability.
Hartley Oscillator
Uses an LC tank with a tapped inductor (L1 + L2) and a single capacitor.
The inductive voltage divider sets feedback fraction B = L2/L1.
Commonly used in AM radio and RF signal generation due to easy frequency adjustment via a variable capacitor.
Equations Used
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Results auto-scale across Hz / kHz / MHz, Ω / kΩ / MΩ, and nH / µH / mH.
All calculations use exact π (Math.PI) — no approximations.
thank you
glad to hear it helped
resistor R1 is not indicated on the diagram. (the lamp)
yes the Lamp acts as a variable resistor
What is RF supposed to be?
I used RF or Rf to denote the feedback resistor.
For high frequency (50-80MHz) which colpitt oscillator will be best?
You can use colpitts or hartley oscillator for that range of frequency
yes true