Using a BJT biased at IC = 1 mA, design a Colpitts oscillator to operate at 0 = 106

Chapter 18, Problem 18.11

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QUESTION:

Using a BJT biased at IC = 1 mA, design a Colpitts oscillator to operate at 0 = 106 rad/s. Use C1 = 0.01F and assume that the coil available has a Q of 100 (this can be represented by a resistance in parallel with C1 given by Q/0C1). Also assume that there is a load resistance at the collector of 2 k and that for the BJT, ro = 100 k. Find C2 and L.

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QUESTION:

Using a BJT biased at IC = 1 mA, design a Colpitts oscillator to operate at 0 = 106 rad/s. Use C1 = 0.01F and assume that the coil available has a Q of 100 (this can be represented by a resistance in parallel with C1 given by Q/0C1). Also assume that there is a load resistance at the collector of 2 k and that for the BJT, ro = 100 k. Find C2 and L.

ANSWER:

Step 1 of 3

Given,

Current,

Oscillating frequency of the Colpitts oscillator,

The capacitance,

The charge

Resistance at the collector,

The resistance of the BJT,

Diagram of the Colpitts oscillator:

Diagram, schematic

Description automatically generated

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