Transcription of AN13 - High Speed Comparator Techniques
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AN13 - High Speed Comparator Techniques
Application Note 13AN13-1an13fApril 1985 High Speed Comparator TechniquesJim WilliamsL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. INTRODUCTIONC omparators may be the most underrated and underuti-lized monolithic linear component. This is unfortunate because comparators are one of the most flexible and universally applicable components available. In large measure the lack of recognition is due to the IC op amp, whose versatility allows it to dominate the analog design world. Comparators are frequently perceived as devices, which crudely express analog signals in digital form a 1-bit A/D converter. Strictly speaking, this viewpoint is correct. It is also wastefully constrictive in its outlook.
Linear circuits operating with this kind of speed make many engineers justifiably wary. Nanosecond domain linear circuits are widely associated with oscillations, mysteri-ous shifts in circuit characteristics, unintended modes of operation and outright failure to function. Other common problems include different measurement
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