I have a high pass and low pass filter, which look like this,
R1 = 1kΩ R2 = 10kΩ , and C1 = 10 nF
I need to find the breakpoint values for each of these filters. When I put them into LTSpice, it gives me 14.1kHz for the low pass filter, and 1.8kHz for the high pass filter.
But when I use the equation 1/(2∏RC) to work out what the values should be ideally, it gives me something noticeably different.
I know that this is because I'm not properly taking into account the second resistor, but I don't know how I to do this.
How do I work out cutoff frequencies for filters in circuits with more than 1 resistor?
thanks
R1 = 1kΩ R2 = 10kΩ , and C1 = 10 nF
I need to find the breakpoint values for each of these filters. When I put them into LTSpice, it gives me 14.1kHz for the low pass filter, and 1.8kHz for the high pass filter.
But when I use the equation 1/(2∏RC) to work out what the values should be ideally, it gives me something noticeably different.
I know that this is because I'm not properly taking into account the second resistor, but I don't know how I to do this.
How do I work out cutoff frequencies for filters in circuits with more than 1 resistor?
thanks
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