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Four Quadrant Multiplier Circuit
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Last Updated: December 31, 2017 06:48 AM


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4 ICs implement video AGC & DC restore -  06/18/98 EDN-Design Ideas Four ICs--a multiplier, a sync separator, an op amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals  (Figure 1).  The circuit consists of three main paths  the signal path, the gain-control path, and the dc-restore path.  The input video signalFile contains several Design Ideas, scroll to this one__ Circuit Design by Tamara Ahrens and Mike Wong, Elantec Semiconductor Inc, Milpitas, CA   

4-quadrant power supply provides any-polarity voltage & current -  01//08/04 EDN-Design Ideas A conventional power supply operates only in the first quadrant; positive-voltage output and current are sourced to a load or, with a deliberately miswired output, statically in the third quadrant as a "minus" supply.  The conventional supply cannot, however, operate in either the second quadrant as an adjustable load for a minus supply, for example, or the fourth quadrant as a discharge-testing__ Circuit Design by Jon Munson, Linear Technology, Milpitas, CA

Compact, Four-Quadrant Lock-In Amplifier Generates Two Analog Outputs -  12/05/09 EDN-Design Ideas Generate a pair of quadrature-phase digital signals__ Circuit Design by Stefano Salvatori and Marco Girolami, Universita Degli Studi Roma Tre, Rome, Italy

Four ICs implement video AGC & DC restore -  06/18/98 EDN-Design Ideas Four ICs--a multiplier, a sync separator, an op amp, and a dc-restore IC--along with a handful of passive components can implement a complete AGC and dc-restore circuit for video signals  (Figure 1).  The circuit consists of three main paths  the signal path, the gain-control path, and the dc-restore path.  The input video signalFile contains several Design Ideas, scroll to this one__ Circuit Design by Tamara Ahrens and Mike Wong, Elantec Semiconductor Inc, Milpitas, CA   

Four quadrant power supply provides any-polarity voltage & current -  01//08/04 EDN-Design Ideas A conventional power supply operates only in the first quadrant; positive-voltage output and current are sourced to a load or, with a deliberately miswired output, statically in the third quadrant as a "minus" supply.  The conventional supply cannot, however, operate in either the second quadrant as an adjustable load for a minus supply, for example, or the fourth quadrant as a discharge-testing__ Circuit Design by  Jon Munson, Linear Technology App Note, Milpitas, CA

Quad HDMI Input, Fast Switching Multiplexer using the ADV7612 Receiver with Extended Temperature Range  -  A software package is available showing how to handle communication and authentication in an HDMI repeater application (see http://www.  ez.  analog.  com/community/video___ Analog Devices from the Lab

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes___ Linear Technology/Analog Devices

Quadraphonic Amplifier -  This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card.  There is no volume control, audio levels being directly controlled from the sound card itself.   __ Designed by Andy Collison

Quadrature (sine/cosine) voltage controlled oscillator -  Several schematics on this page, scroll to find this one.  The first circuit is a dual ramp generator where the positive and negative ramps are generated separately.  This circuit was used as a ramp generator for a transistor curve tracer: the positive going ramp was used for testing NPN transistors and the negative ramp for testing PNP transistors.   __ Designed by Richard Torrens


Four Quadrant Multiplier Circuits


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