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Analysis of low-frequency noise reduction by autozero technique

Analysis of low-frequency noise reduction by autozero technique

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© The Institution of Electrical Engineers
Published

This letter analyses the low-frequency noise reduction produced by the autozero technique. A very simple model is established, and the output average power spectrum in the case of lowpass filtered white noise and 1/f noise is calculated. This analysis clearly shows the limitation to low-frequency noise reduction introduced by the foldover effect.

Inspec keywords: operational amplifiers; CMOS integrated circuits; white noise; random noise; low-pass filters

Other keywords: output average power spectrum; low-frequency noise reduction; 1/f noises; autozero technique; foldover effect; lowpass filtered white noise; CMO operational amplifier

Subjects: Amplifiers; Active filters and other active networks; CMOS integrated circuits

References

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      • K.C. Hsieh , P.R. Gray , D. Senderowicz , D.G. Messerschmitt . A low-noise chopper-stabilised differential switched-capacitor filtering technique. IEEE J. Solid-State Circ. , 708 - 715
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      • F. Krummenacher . Micropower switched capacitor biquadratic cell. IEEE J. Solid-State Circ. , 507 - 512
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