System Considerations for High-Speed and Low-Power Switched-Opamp Circuits
While circuits’ performance could be increased quite linearly with the advancement of technologies, modifications and novelties in the system-level designs could achieve far more significant and pronouncing performance improvements. This chapter begins with a brief review of the double-sampling technique, which has been one of the most useful techniques in boosting the operation speed of SC circuits by double without requesting higher opamps’ performance. More importantly, most of the conventional SC architectures can be directly transformed into their corresponding double-sampling architectures by duplicating a parallel path to operate alternately while maintaining the overall characteristics. However, the transformed architectures are usually not optimal in term of opamp settling consideration, which could easily waive the benefits gained by the double-sampling operation. The settling problem will be investigated by considering a conventional double-sampling SC biquadratic filter. After that, a fast-settling double-sampling SC biquadratic filter architecture will be proposed.
KeywordsSign Inversion Clock Phase Integration Phase System Consideration Conventional Realization
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