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CACD Group updated 2000.03.30 Author Janez Puhan |
High-Pass Filter with TransistorThe circuitBecause of circuit simplicity, an additional example of a high-pass filter with a transistor as an emitter follower is shown bellow. The calculated slope differs slightly from -12dB/octave, but this is the price of having a simplified circuit version. The input file (high-pass_filter_with_transistor.cir)high-pass filter with transistor * fo = 1 / (2 pi (r1 r2 c1 c2)^(1 / 2)) Cutoff Frequency * d = (1 + c2 / c1) (r1 c1 / (4 r2 c2)) Damping Coefficient .control set units = degrees ac dec 50 10Hz 100kHz plot vdb(4) vp(4) xlabel f[Hz] ylabel 'magnitude[dB] phase[degree]' + title 'AC analysis' .endc v1 8 0 dc 10V v2 6 0 dc -10V v3 1 0 dc 0 ac 1 r1 2 4 10k r2 3 0 39k r3 4 6 10k c1 1 2 10nF c2 2 3 10nF q1 8 3 4 bjtn .model bjtn npn .end The results |
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