A Complex ΔΣ Modulator with an Improved STF

  • Bupesh PanditaEmail author
Part of the Analog Circuits and Signal Processing book series (ACSP)


The presence of interferers puts a severe demand on the linearity requirements of the analog circuitry of a ΔΣ ADC and, in such applications, instead of unity signal-transfer functions (STF), it may be more desirable to have an STF with improved out-of-band attenuation. Depending on the application, e.g., single sideband (SSB), it may also be desirable to have higher attenuation in image band frequencies. Historically, complex transfer functions have been based on frequency transformations of real prototype filters. However, because of arithmetical symmetry, such complex transfer functions are inefficient in meeting the asymmetric requirements of a wireless receiver.


Loop Filter Filter Approximation Complex Filter Signal Transfer Function Stopband Attenuation 
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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.AMDMarkhamCanada

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