Hillsboro, Ore. – Lattice Semiconductor Corp. has extended the performance range of its fifth-order low-pass filter, ispPAC80, to 750 kHz for Butterworth topologies. The previous top end was 500 kHz.

Figure 2 shows the filter's measured magnitude response for a 1V-rms input signal. The filter's passband gain of 0 dB is flat within 1.2 dB for frequencies as high as 20 kHz. With its –3-dB point at ...

Here we’re using low-pass filters to curtail high frequencies (cutoffs are 3 kHz and upwards) in some of the verse section synths and pianos. This creates more space for the vocals.