Colpitt's oscillator to improve frequency stability

Q.  Which among the following measures is/are adopted/used for improving the frequency stability in Colpitt's oscillator?
- Published on 24 Sep 15

a. Clapp oscillator
b. Temperature stabilized chamber
c. Voltage regulators
d. All of the above

ANSWER: All of the above

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    The transistorized Colpitt's oscillator does not exhibit stability at high frequencies due to variation of these parameters with respect to temperature & the effect of collector base internal capacitances in feedback circuit.

    Frequency stability can be improved by using voltage regulator, Clapp's oscillator and temperature stabilized chamber. Use of voltage regulator has a provision of maintaining a constant level of supply voltage,which reduces the possibility of instability in frequency of oscillations.

    By enclosing the oscillator circuit with a temperature stabilized chamber, the temperature of a chamber is maintained at a constant desired level. Hence, frequency variations can be prevented due to drift in temperature.

    Clapp's oscillator is the modified form of Colpitt's oscillator which includes an additional capacitor (C3) connected series configuration with an inductor of tank circuit. This capacitor reduces the stray capacitances & assists in preventing the other transistor parameters from getting affected especially due to C1 & C2.

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