Low-power op amp defeats crossover distortion

Low-power op amp defeats crossover distortion

As low-power single-supply op amps are used in today’s battery-powered portable applications, they have crossover error and changes in their common-mode voltage, which is a result of their two-stage input topology.

The OPA369 zero crossover op amp (Electronic Products , October 2007, p. 109) solves this design problem by defeating input crossover to nearly zero. The device shows a single CMRR value of 100 dB due to little or no output distortion because there is very little change in the input offset voltage as the input common-mode voltage is increased over the full input range.

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