DPPs program key parameters of bandpass filter


Posted on Mar 19, 2013

The three-amplifier implementation of the state-variable filter in Figure 1 provides for second-order bandpass, highpass, and lowpass responses. The strength of the circuit, however, is in the bandpass response (VOUT/VIN), in which it`s easy to achieve high gain (G) and high Q. These two characteristics are important in applications in which selectivity is a key parameter in the filter. The application value of the circuit becomes even greater when DPPs (digitally programmable potentiometers) control and vary the bandpass filter`s center frequency, f0, and passband gain, G.


DPPs program key parameters of bandpass filter
Click here to download the full size of the above Circuit.




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