# lecture03 - High pass filter Diodes P N junction(1 do not...

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1 ms 0.05 ms Design exercise: Need to drive a 100 kohm load and get rid of the 20 kHz “noise” Step 1: choose circuit 100k 100k OR Step 2: choose R (a) 100 k : (b) 8 k : (c) 1 M : Step 3: f 3db (a) 20 kHz (b) 2 kHz (c) 200 Hz Step 4: choose C RC db 1 3 Z

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V in V out = I Z 1 Z 2 Z 1 = V in Z 1 + Z 2 Z 1 Recap: Voltage divider Impedance of capacitor: Z c = 1/j Z C Z 1 Z 1 Z 2 Z 2 Z 1 Î f when Z 0 Z 2 when 0 Low pass filter

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Unformatted text preview: High pass filter Diodes ( P N junction) (1) do not obey ohms law (2) Current only flows in one direction Reversed bias: no current flows Forward bias: current flows P N P N Diodes current V I 0.6V Simplified behavior of an ideal diode V V V diode = 0.6 V...
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lecture03 - High pass filter Diodes P N junction(1 do not...

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