Monday 21 March 2011

Oscillation frequency of a colptis oscillator

The ideal frequency of oscillation for the circuits in Figures 1 and 2 are given by the equation:
f_0 = {1 \over 2 \pi \sqrt {L \cdot \left ({ C_1 \cdot C_2 \over C_1 + C_2 }\right ) }}
where the series combination of C1 and C2 creates the effective capacitance of the LC tank.
Real circuits will oscillate at a slightly lower frequency due to junction capacitances of the transistor and possibly other stray capacitances
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