Dynamic slew rate control based on a feedback signal

Abstract

Techniques for enhancing the slew rate of an active circuit within a feedback circuit (such as a ΔΣ ADC) are described. In one design, a ΔΣ ADC includes an integrator, a slew rate enhancement circuit, and a control circuit. The integrator receives an input signal and provides an output signal. The slew rate enhancement circuit enhances the slew rate of the integrator based on a feedback signal in the ΔΣ ADC. The slew rate enhancement circuit may provide (i) a boost current for only certain values (e.g., the largest and smallest values) of the feedback signal or (ii) different amounts of boost current for different values of the feedback signal. In one design, the slew rate enhancement circuit includes at least one boost circuit coupled to the integrator. Each boost circuit provides a boost current to enhance the slew rate of the integrator when that boost circuit is enabled.

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