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High pass passive RC filter

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  • Nicolae Sfetcu
    High pass passive RC filter This circuit is a high pass filter built with passive components. This RC filter passes high frequency signals but rejects those
    Message 1 of 1 , Nov 27, 2000
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      High pass passive RC filter

       

      This circuit is a high pass filter built with passive components. This RC filter passes high frequency signals but rejects those with a lower frequency. Capacitor C1, the reactive element, is in series with the load, and resistor R1, shunts the load. The high-pass filter cuts off or blocks all frequencies below the cutoff frequency, fc. The cutoff frequency occurs where capacitive reactance of C1 equals the value of resistor R1. Cutoff frequency is defined by: fc=1/(2*Pi*R1C1)=1/(6.28*R1*C1). The cutoff frequency (fc) is that frequency at which the signal output voltage is 6 decibels (dB) below its peak value. The cutoff frequency can also be measured at the half-power points (-3dB). These are at 70.7% of the peak power with the real power dissipated at 50% of maximum. The rollup slope, to the fc point, is 6 dB per octave. Resistive-capacitive filters are best suited to low frequency filtering (up to 100kHz). This is a first-order filter.

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