The design and implementation of a monolithic voltage-controlled amplifier with an exponential gain-control characteristic is described. Sources of deviation from ideal performance, including distortion, noise, offset change with gain, and noise modulation, are analyzed. Techniques used in this design to minimize these sources of error are described. Other factors influencing performance, such as stability, device geometry, physical layout, and the seminconductor process utilized, are discussed. Performance data on the resulting device is presented.
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