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A switched capacitor oscillator with precision amplitude control and guaranteed start-up

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3 Author(s)

A description is given of the design and performance characteristics of a precision switched capacitor (SC) oscillator. Features of this circuit include precision control over both frequency and amplitude, as well as means to ensure that oscillations start regardless of power-up sequence, reasonable offsets, etc. Many attributes of this oscillator are obtained by exploiting the unique properties of switched capacitor circuits; the proposed circuit does not possess a direct active-RC counterpart. The authors include derivations of analytical expressions for output frequency, amplitude, and harmonic distortion.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:20 ,  Issue: 2 )