The method of designing the programmable filter used in signal measurement of electrophysiology is described.

This paper introduces programmable filter technology to traditional hardware for heat-rate detection, then the midfrequency of R wave filter becomes regulable resultingly, and thus a heart rate detection system can precisely position R waves and calculate heart rates of different animals.

A 1μm CMOS eight-bit integrated circuit was designed and fabricated,used for sampling,weighting,controlling and summing of both SAW delay lines and SAW IDTs in multi-chip module (MCM) programmable SAW filter.

A kind of speed sensor-less DTC method with a programmable low pass filter(LPF) to estimate stator flux was presented.

The spectrum width is expanded from 38 nm to 66 nm,and the output laser pulse is consequently squeezed from 35 fs to 20 fs in the 10 Hz femtosecond regenerative amplifier,with an acoustic-optic programmable dispersive filter(AOPDF) for dispersion pre-compensation and spectrum shaping of the input seed pulses.

In order to solve the problem that the period of a signal is slowly time varying and that the signal is affected seriously by harmonics and noise in the signal processing and measurement, an adaptive bandpass filter (ADBF) is designed by using the programmable switch capacitor filter(PSCF) and a phase locked loop(PLL).