A Differential Complementary Colpitts Oscillator based on Common Drain Topology

In this paper we present a new topology complementary differential Colpitts oscillator. The circuit is realized by stacking one PMOS common drain Colpitts oscillator on top on a NMOS common drain Colpitts oscillators. Measurements of a prototype implemented with discrete components have been used to verify the correct operation of the system. The Oscillator was realized using the integrated circuits ALD1105 connected to a 100μH and a Crystal with a resonance frequency of 4,915MHz. The oscillator connected to the crystal showed a phase noise of -95 dBc/Hz at 100KHz offset.

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