IFD:Analog Circuits and Interfaces/introduction to electronics: Difference between revisions

IFD:Analog Circuits and Interfaces/introduction to electronics (view source)

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 * Unfortunately we can't set the cutoff frequency independently of the gain of our filter with just one resistor (e.g. a potentiometer). With another filter topology, the "bridged T low pass filter", we can tune the filter without changing its gain. To get a bridged T filter, we exchange the capacitor in the feedback loop with two capacitors in series and add a resistor.
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+[http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+12.050203812241895+54+5+43%0Ax+-167+-245+39+-242+4+18+Bridged%5CsT%5CsLow%5CsPass%5CsFilter%0A207+-112+0+-80+0+4+output%0Ac+-176+-192+-240+-192+0+1.0000000000000001e-7+0.07208828582967249%0Ar+-112+-64+-240+-64+0+1000%0AR+-320+-64+-368+-64+0+6+1591+1+0+0+0.5%0Ax+-20+-133+185+-130+4+14+f%5Cs%5Cq%5Cs1%5Cs/%5Cs(2*pi*sqrt(R1*R2*C1*C2)))%0Ax+-21+-108+173+-105+4+14+f%5Cs%5Cq%5Cs1%5Cs/%5Cs(2*pi*10%5E3%5CsOhm*10%5E-7%5CsF)%0Ax+-21+-81+149+-78+4+14+f%5Cs%5Cq%5Cs10%5E4%5Cs/%5Cs(2*pi)%5Cq10000/%5Cs2pi%0Ax+-21+-53+62+-50+4+14+f%5Cs%5Cq%5Cs1591,5%5CsHz%0Ax+-20+-171+170+-168+4+14+Calculation%5Csof%5Csfilter%5Cscutoff%5Cspoint%0Aw+-240+-64+-240+-16+0%0Aw+-112+0+-112+-64+0%0Aa+-240+0+-112+0+8+15+-15+1000000+8.53353504561735e-8+0+100000%0Aw+-240+-192+-240+-64+0%0Aw+-112+-192+-112+-64+0%0Ax+-181+-37+-163+-34+4+14+R1%0Ax+-210+-152+-192+-149+4+14+R2%0Ax+-14+42+81+45+4+14+-R2/R1%5Cs...%5CsGain%0Ax+-14+95+157+98+4+14+R2%5Cs...%5CsSets%5Cscutoff%5Csfrequency%0Ax+-14+69+83+72+4+14+R3%5Cs...%5CsSets%5Csgain%0Ac+-112+-192+-176+-192+0+1.0000000000000001e-7+-0.08062190621064029%0Ar+-320+-64+-240+-64+0+1000%0Ag+-240+16+-240+48+0%0Ar+-176+-192+-176+-128+0+1000%0Ag+-176+-128+-176+-112+0%0Ax+-291+-36+-273+-33+4+14+R3%0Ax+-13+123+276+126+4+14+R1%5Cs...%5CsThe%5Csbigger%5CsR1,%5Csthe%5Csmore%5CsQ%5Cs(resonance)%0Ao+1+4+0+5128+2.5+0.00009765625+0+2+1+3%0A Bridged T Low Pass Filter]
 [http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+9.001713130052181+54+5+43%0Ax+-132+-156+68+-153+4+18+Triangle%5Cs/%5CsSaw%5CsGenerator%0Aa+-240+0+-128+0+8+15+-15+1000000+0+3.6818713027031436+100000%0Ag+16+32+16+64+0%0A207+128+16+176+16+4+output%0Ac+16+-64+128+-64+0+1e-8+0.5101696765160468%0Ar+-240+48+-240+128+0+100000%0Ar+-240+48+-128+48+0+270000%0Aw+-240+16+-240+48+2%0Aw+-128+0+-128+48+0%0Ar+-64+0+16+0+0+100000%0Ad+-80+-64+-128+-64+2+default%0Aa+16+16+128+16+8+15+-15+1000000+0.000005101645748702981+0+100000%0Aw+16+-64+16+0+0%0Aw+128+-64+128+16+0%0Aw+128+16+128+128+0%0Aw+128+128+-240+128+0%0Ag+-240+-16+-288+-16+0%0Ag+-64+64+-64+80+0%0Ar+-64+0+-64+64+0+50000%0Ar+-128+0+-64+0+0+50000%0Aw+-128+-64+-128+0+0%0Ar+-80+-64+-32+-64+0+1000%0As+-32+-64+16+-64+0+1+false%0Ax+-21+-87+5+-84+4+8+triangle%0Ax+-16+-44+-3+-41+4+8+saw%0Ao+7+8+0+4098+20+0.00009765625+0+2+7+3%0Ao+8+8+0+4106+20+0.1+1+2+8+3%0Ao+3+8+0+4106+20+0.1+2+2+3+3%0A Trianlge / Saw Generator]