Switched-Cap Filter

• 13-bit signed input data
  • Low pass
  • High pass
  • Band pass
  • Band stop
• Continuous-time output
• Automatic sample rate for best performance or set by user
• Filter response graphs in frequency and time domains
• Optional input to change the polarity of filter output
• Comparator output as zero-crossing detector

General Description

The Switched-Cap Filter Component is a 2nd-order inverting filter using the Universal Analog Block (UAB). The filter input is sampled at a specified sample rate resulting in a "stepped" output waveform. User-defined parameters such as the sample rate, corner frequency, center frequency, and bandwidth are realized as a set of capacitor values. A high bandwidth operational amplifier from the Continuous Time Block (CTB) is used to buffer the filter output.