Ratiometric vs. Phase Method Decoder
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The ratiometric converters can track the shaft movements faster and can be mounted at a greater distance from resolvers as compared to phase method decoders. They are also more immune to electrical noise and variations of voltage, frequency, temperature, etc. Due to the more complex circuitry involved, the ratiometric converters are usually more expensive than phase method decoders. In general, for more reliable opera-tion, the ratiometric converter should be used. In some appli-cations, where wiring run is short and well shielded, system speed is slow or slow reacting outputs like electromechanical relays are used and the installation is relatively free of electrical noise, the phase method decoder may be considered for a cost effective design.