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Square Wave To Sine Wave Converter Disclosure Number: IPCOM000053840D
Original Publication Date: 1981-Nov-01
Included in the Prior Art Database: 2005-Feb-12

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Butler, A Gardner, HJ Hargarten, J Mathews, H [+details]


This article describes a circuit to generate a low distortion sine wave The sine wave is locked in phase to a square-wave input. An intermediate triangular wave is constructed by switching a regulated current in and out of a capacitor. The triangular wave is fed into a differential pair amplifier with emitter degeneration. The differential pair amplifier shapes the triangular signal into the precise sine wave. The circuit is independent of temperature variations.