With an FFT, it is easy to digitally remove unwanted frequencies. You could achieve this removal with an analog circuit, but it would be hardware-intensive. With digital-filter designs on the horizon, ...

The filter in Figure 1 is implemented with four resistors and two capacitors. To create a programmable filter, two of the four fixed resistors in this circuit are replaced with a dual 100k, 8-bit ...

Digital filters primarily are used when transfer-function requirements have no counterpart in the analog world or when a DSP already resides on the circuit board to perform other functions.

This circuit samples and filters the modulator stream of 1-bit codes. At the modulator output, high-frequency noise and high-speed sample rates are problems. However, because the signal now resides in ...