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 %)*t_Fc;
full boost (-14 %…14 %)*t_Fc.

• phase asymmetry range: (-30 %…30 %)*t_Fc;
  
• maximum input signal: 100 mV;
  
• maximum output filter level: 600 mV_p-p, diff ;
  
• filter d.c. gain; 17 dB…19 dB