Summing Amplifier - Freecircuits.net

Electronic circuits schematics diagrams FreeCircuits.net [category-12.html] Summing Amplifier By internum The summing amplifier, a special case of the inverting amplifier. The summing amplifier, a special case of the inverting amplifier, is shown in Figure 1. The circuit gives an inverted output which is equal to the weighted algebraic sum of all three inputs. The gain of any input of this circuit is equal to the ratio of the appropriate input resistor to the feedback resistor, R4. Amplifier bandwidth may be calculated as in the inverting amplifier shown in Figure 1 by assuming the input resistor to be the parallel combination of R1, R2, and R3. Application cautions are the same as for the inverting amplifier. If an uncompensated amplifier is used, compensation is calculated on the basis of this bandwidth as is discussed in the section describing the simple inverting amplifier. Figure 1. Summing Amplifier R5 = R1 || R2 || R3 || R4 For minimum offset error due to input bias current The advantage of this circuit is that there is no interaction between inputs and operations such as summing and weighted averaging are implemented very easily. 0 09 December 2007 See also: Root Extractor Taking the root of a number using log converters is a fairly simple matter. All that is needed is to take the log of a voltage, divide it by, say 1⁄2 for the square root, and then take the antilog. Computing Circuits A circuit which performs both multiplication and division in this fashion. Integrator This circuit is essentially a low-pass filter with a frequency response decreasing at 6 dB per octave. Home Audio Video & TV Power RF Digital Computer Telephone Measurement Security Lights & LED Oscillators Op Amplifiers Other Search Copyright © 2007 freecircuits.net