Abstract
A novel self-tracking high-pass filter by using analog multiplier and current feedback op-Amp (CFA) is proposed in this paper. The frequency-voltage (F/V) converter transforms the input pulse signal into the voltage, and then the output of F/V converter controls the cut-off frequency of voltage controlled high-pass filter. Thus, the cut-off frequency of designed filter is linear with the frequency of input signal in case that resistors and capacitors are reasonable adjusted. The experiment and simulation results show that the cut-off frequency of designed filter is 1 kHz-100 kHz..
Highlights
Filters are widely used in information processing, automatic control, communications, and other fields
The fixed cut-off frequency filter can be used in the situation of narrow range of the signal frequency
A self-tracking high-pass filter is proposed in this paper, and its cut-off frequency follows the frequency of the input signal
Summary
Filters are widely used in information processing, automatic control, communications, and other fields. A self-tracking high-pass filter is proposed in this paper, and its cut-off frequency follows the frequency of the input signal. The cut-off frequency of filter can be adjusted by variable resistors and capacitors [1, 2]. Adjusted by bias current [3,4,5,6] In these circuits, floating voltage controlled high-pass filter capacitor is used, and X terminal of the CCII is connected with a capacitor, which is easy to cause the circuit self-. Where Rs Rs1 Rs2 .From (1) the output voltage Vf is linear with the input frequency fi in case that resistors and capacitors are reasonable adjusted
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