Colpitt's Oscillator

 
  • AMPLIFIER
  • OSCILLATOR
  • HARTLEY
  • HARTLEY OSCILLATOR
  • COLPITT
  • COLPITTS OSCILLATOR
  • FREQUENCY
  • CAPACITIVE
  • VOLTAGE DIVIDER
  • DC SOURCE
  • DIVIDER
  • OSCILLOSCOPE
  • BJT
  • INDUCTOR
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Overview

The Colpitts oscillator is another type of LC oscillator like the Hartley oscillator. The basic configuration of the Colpitts Oscillator resembles that of the Hartley Oscillator but the difference this time is that the centre tapping of the tank sub-circuit is now made at the junction of a "capacitive voltage divider" network instead of a tapped autotransformer type inductor as in the Hartley oscillator. As with the Hartley oscillator, the Colpitts oscillator uses a single stage bipolar transistor amplifier as the gain element. The frequency of oscillation here is given by f = 1/(2* pi * sqrt ( L * Ct)) where Ct is the combined capacitance of the capacitors given by 1/Ct = 1/C1 + 1/C2

Circuit info

Author

Created on: 21 Feb 2013
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