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Analog Multiplier Circuits
Last Updated on: Thursday, April 07, 2016 01:00 PM

 
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
2 Quadrant Analog Multiplier uses No Log Amps -  10/10/96 EDN Design Idea     You usually obtainproduct of two values by summingoutputs of logarithmic Amplifiers. block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log Amplifiers. VA and VB aremultiplier inputs. triangle generator produces a linear triangle whose voltage range is between0V andmaximum value that VB can attain (VB>=0V]. VA may assume both positive and negative values. Figure 2 showscircuit waveforms. . .  [by Giovanni Romeo, Istituto Nazionale di Geofisica, Rome, Italy]

2-quadrant multiplying DAC utilizes octal CMOS buffer -  09/30/13  EDN Design Idea   Here's a novel approach to making a multiplying DAC. . .  [by Ajoy Raman]

3 Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio. . . .  [Bill Bowden, designer]

Analog Computation with Magnetoresistance Multipliers -  Scroll to find this circuit. . .  [Analog Devices-Analog Dialogue by Gitlin, R. M.]

Bit-Shifting Method Performs Fast Integer Multiplying By Fractions In C -  05/29/08  EDN Design Idea   Instead of calling math-library functions, you can multiply integers using bit shifting. . .  [by Aaron Lager, Panamax Furman, Santa Rosa, CA]

Capacitance-Multiplier Power Supply -  High-quality audio Amplifiers require a very efficient power supply with negligible ripple, hum and buzz. An ordinary bridge-type power supply has a drawback in that it drops to 3 to 4 volts when connected to the load. A transistor- or IC-regulated power supply is much better option but still it has some ripple and hum objectionable to sharp ears. . . .  [ EFY Enterprises Pvt. Ltd. All rights reserved.]

Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, Amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as. . .  [by Bill Bowden]

Half-flying capacitor analog multiplexer for microControllers -  This technique uses digital  I/O pins to multiplex analog voltages into an analog input on the microcontroller. The method is most suitable for signals that do not need to be sampled frequently and it may be extended to accommodate a large number of inputs, though for a large number of inputs, the use of a separate analog multiplexer or a mincrocontroller with an integrated multiplexer would often be a better choice  . . .  [From Dick Cappels' project pages]

LED Decibel Meter -  The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, Amplified by a transistor stage and one LM324 op-amp section. You can also use a dynamic microphone but I found the speaker was more sensitive. The remaining 3 sections of the LM324 quad op-amp are used as. . .  [by Bill Bowden]

LMH730151 Triple 2:1 Multiplexer Evaluation Board -  Application Note  . . .  [National Semiconductor]

LMH730276 4:1 Multiplexer Evaluation Board -  Application Note  . . .  [National Semiconductor]

LMH730277 2:1 Multiplexer Evaluation Board -  Application Note  . . .  [National Semiconductor]

Multipliers vs. Modulators -  Analog Devices-Analog Dialogue. . .  [by Bryant, James]

Rectifier tracks positive and negative peaks -  06/08/06 EDN Design Idea   Versatile precision rectifier also delivers full-wave output. . .  [by Harry Bissell Jr]

Simple 3 Transistor Audio Amp 50 Milliwatt -  Here is a little audio Amplifier similar to what you might find in a small transistor radio. . .  [Bill Bowden, designer]

Single Pulse Voltage Multiplier -  Sometimes it's necessary to generate a higher voltage pulse from logic circuits than the circuits themselves can supply. The need to generate a programming pulse for Atmel flash controllers was one of those. In that case, I needed to generate an infrequent pulse that. . .  [From Dick Cappels' project pages]

Temperature controller has "take-back-half" convergence algorithm -  09/15/05  EDN Design Idea   Enhanced closed-loop control balances stability, responsiveness. . .  [by W Stephen Woodward, University of North Carolina, Chapel Hill, NC]

Two Quadrant Analog Multiplier uses No Log Amps -  10/10/96 EDN Design Idea     You usually obtainproduct of two values by summingoutputs of logarithmic Amplifiers. block diagram in Figure 1 shows a configuration that produces a two-quadrant product of analog signals but uses no log Amplifiers. VA and VB aremultiplier inputs. triangle generator produces a linear triangle whose voltage range is between0V andmaximum value that VB can attain (VB>=0V]. VA may assume both positive and negative values. Figure 2 showscircuit waveforms. . .  [by Giovanni Romeo, Istituto Nazionale di Geofisica, Rome, Italy]

Two-quadrant multiplying DAC utilizes octal CMOS buffer -  09/30/13  EDN Design Idea   Here's a novel approach to making a multiplying DAC. . .  [by Ajoy Raman]


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Analog Multiplier Circuits


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