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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 signal.....File contains several Design Ideas, scroll to this one..... [Design
Idea by Tamara Ahrens and Mike Wong, Elantec Semiconductor Inc, Milpitas, CA]
Four-quadrant power supply
provides any-polarity voltage and 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..... [Design Idea by Jon
Munson, Linear Technology, Milpitas, CA]
