Design and Implement of Programmable Filter
Abstract:This system mainly consists of a programmable filter, MCU control system and LCD1602 display system.The AT89S52 MCU is the control core of the system, combined with the basic principle of double second order loop filter MAX262, the circuit can realize lowpass, highpass and bandpass filter function. We can set the quality factor of the filter and the cutoff frequency using the buttons. Low pass, high pass filter cutoff frequency and bandpass filter with the center frequency can be preset ranged for 30kHz-49kHz,stepping 1 kHz and Q value range from 1 to 5. In addition, the system adopts LCD display, it is man-machine interface friendly.
Key words:programmable filter;MAX262;AT89S52;LCD1062