2/6/2024 0 Comments Is decibel scale logarithmic![]() The filter output is simply accessed across the resistor instead of the capacitor. Note that because the same resistor and capacitor were used, the cutoff frequency has not changed. ![]() Below is a Bode plot of the high-pass RC filter frequency response a few sections back.Where L denotes the relative difference between the two powers P2 and P1 on a logarithmic. ![]() The cutoff frequency, which is 1592 Hz for this particular circuit, corresponds to a 3 dB attenuation, and can be used as a figure-of-merit for the response of the filter. A decibel scale is a logarithmic scale and works differently than a ruler (which is a linear scale). To explain what the decibel scale is, and where it comes from. This is the cutoff frequency, f 0, of the RC filter, which is expressed by the following relationship: f 0 = 1/(2πRC) The intersection point of these two lines coincides with the rounded section of the plot. For radar, the convention is to measure the received power in units of milliwatts and to define 1 mW as the reference value for a decibel scale. Every Bode plot has two straight lines: the relatively flat response where little attenuation occurs and a linear response of -20 dB/decade at higher frequencies. Although the decibel is a measure of relative rather than absolute intensity, it is possible to set up an absolute scale by arbitrarily defining some particular intensity or power level as a reference. ![]() Notice that low frequencies are unattenuated, but attenuation increases with higher frequencies. Below is a Bode plot of the low-pass RC filter frequency response shown a few sections back. ![]()
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