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CONTINUOUS TIME FILTER

The continuous-time filter comprises a 7-order, 0.05 degree equiripple low-pass filter with a second-derivative section for pulse slimming. The filter transfer function is characterized by three parameters that controls the boost in the second-derivative section, the phase asymmetry, and the cut-off frequency of the low-pass filter. These parameters are programmable.

The DC gain of the filter is independent of the cutoff frequency and the boost.

FEATURES

  • 0.29 mm BiCMOS 3.3 V technology
  • minimum cutoff frequency: 6 MHz
  • maximum cutoff frequency: 130 MHz
  • maximum boost: 13 dB
  • boost variation: -1.5 dB…1.5 dB
  • gain variation: -3 dB…3 dB
  • group delay variation:
    • no boost: (-10 %…10%)*tFc
    • full boost: (-14 %…14 %)*tFc
  • phase asymmetry range: (-30 %…30 %)*tFc
  • maximum input signal: 100 mV
  • maximum output filter level: 600 mVp-p, diff
  • filter d.c. gain; 17 dB…19 dB

SYSTEM OVERVIEW

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