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Gm-C Filters

  • Heimo Uhrmann
  • Robert Kolm
  • Horst Zimmermann
Part of the Springer Series in Advanced Microelectronics book series (MICROELECTR., volume 45)

Abstract

Analog filters are required in many mixed-signal systems. They can be used for anti-aliasing purposes, before signals are sampled in an A/D converter or they can be used for reconstructing the signal after a D/A converter. Also at the output of a mixer a filter which suppresses out-of-band interferer signals is necessary. In general, when a filter is designed it is necessary to consider the whole system in which the filter is embedded. Important parameters for filters are in-band and also out-of-band distortions. A high in-band linear dynamic range avoids intermodulation between two in-band signals. Out-of-band distortions are also essential because they describe the immunity against some blockers or disturbances to other channels in a multi-band system. Other important parameters are the noise spectral density or the integrated noise. For some applications the out-of-band spectral noise density should be under a certain level, otherwise the noise would interfere to a neighboring channel. Sometimes, when the same filter is used in the I-path and in the Q-path of a receiver, the mismatch between these two filters should not be too high. G m -C filter topologies, a figure of merit, the state-of-art, the requirements for UWB and three implemented filters are described in this chapter.

Keywords

Supply Voltage Maximum Gain Amplitude Frequency Response Minimum Gain Operational Transconductance Amplifier 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Heimo Uhrmann
    • 1
  • Robert Kolm
    • 1
  • Horst Zimmermann
    • 1
  1. 1.EMCEVienna University of TechnologyViennaAustria

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