Simple Low-pass Filter - Freecircuits.net

Electronic circuits schematics diagrams FreeCircuits.net [category-12.html] Simple Low-pass Filter By internum This circuit has a 6 dB per octave roll-off after a closed-loop 3 dB point. The simple low-pass filter is shown in Figure 1. This circuit has a 6 dB per octave roll-off after a closed-loop 3 dB point defined by fc. Gain below this corner frequency is defined by the ratio of R3 to R1. The circuit may be considered as an AC integrator at frequencies well above fc; however, the time domain response is that of a single RC rather than an integral. Figure 1. Simple Low Pass Filter R2 should be chosen equal to the parallel combination of R1 and R3 to minimize errors due to bias current. The amplifier should be compensated for unity-gain or an internally compensated amplifier can be used. Figure 2. Low Pass Filter Response A gain frequency plot of circuit response is shown in Figure 2 to illustrate the difference between this circuit and the true integrator. 2 09 December 2007 See also: Nonlinear Operational Amplifier Nonlinear Operational Amplifier with temperature-compensated breakpoints Computing Circuits A circuit which performs both multiplication and division in this fashion. More Output Current Swing High Current Output Buffer with a pair of complementary transistors. Home Audio Video & TV Power RF Digital Computer Telephone Measurement Security Lights & LED Oscillators Op Amplifiers Other Search Copyright © 2007 freecircuits.net