The magnitude of the voltage gain (G) on the maximum ideal passive filter is 1 = 0dB which only occ

Low Pass Filter (LPF) or Passed Down Filter is a filter that only passes the signal to a lower frequency nesca than the cut-off frequency (fc) and will attenuate the signal with a frequency higher than the cut-off frequency (fc). At an ideal LPF filter signals with frequencies above the cut-off frequency (fc) will not be missed at all (output voltage = 0 volts). The series of low pass RC filter is a type of passive filter, the frequency response nesca is determined by the configuration of the R and C are used. The basic circuit LPF and LPF frequency response graph as follows. Basic circuit and Frequency Response Graphs RC Low Pass Filters
Passive RC filter circuit LPF above looks like a voltage divider using R. Where in the RC LPF filter teganga output is taken at the meeting point of the RC. The output voltage (V out) passive filter LPF as shown in the equation above can be expressed mathematically as follows.
The magnitude of the voltage gain (G) on the maximum ideal passive filter is 1 = 0dB which only occurs at the frequency of the input signal is below the cut-off frequency (fc). Penguatabn voltage (G) passive RC filter LPF can be written in the following mathematical equation.
In filtrer qualify under (low pass filter, LPF) there are some fundamental characteristics as follows. At the time of the input signal frequency is lower than the cut-off frequency (fc) (f in << fc) the strengthening of the voltage / Gain (G) = 1 or G = 0dB. At the time of the input signal frequency equal to the cut-off frequency (fc) (f in = fc) then ω = 1/RC thus strengthening voltage / Gain (G) becomes -3 dB or weaken voltage of 3 dB. At the time of the input signal frequency is higher nesca than the cut-off frequency (fc) (f in >> fc) the magnitude of the voltage gain (G) = G = -20 1/ωRC or log ωRC So it can be concluded that the low pass filter (Low Pass Filter, LPF) only pass signals with frequencies nesca lower than the cut-off frequency (fc) alone.
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