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 Amplitude and phase equalizer

Details
Inventors: Gyi, Maung;
Assignee: Ampex Corporation (Redwood City, CA)
Primary Examiner: Canney; Vincent P.
Assistant Examiner:
Attorney, Agent or Firm: Strnad; Elizabeth E., Talcott; Joel D.

Minimal realization of an optimum amplitude and phase equalizer is disclosed. A first amplifier circuit including first respective passive filter elements provides both high and low frequency amplitude equalization. A second amplifier circuit including second respective passive filter elements provides first, second or higher order phase equalization, respectively, with gain. The equalizer operates between voltage sources and virtual ground to minimize noise picked up from parasitic capacities and external sources.

DETAILED DESCRIPTION Accordingly, it is an object of the invention to provide an amplitude and phase equalizer for analog or digital signals, having a simplified circuit design in which the total number of active and passive devices is reduced.
It is a further object to provide an amplitude and phase equalizer having an optimum signal-to-noise ratio.
It is another object to provide an amplitude and phase equalizer having a constant time delay, that is, a phase characteristic linearly changing with frequency.
It is still a further object to provide an amplitude and phase equalizer which is immune to stray capacitances and extraneous noise pick-up.
It is another object to provide an amplitude and phase equalizer having simplified adjustment of passive components for high accuracy of equalization.
It is a further object to provide an amplitude and phase equalizer having the above-indicated features and suitable for use in single speed or multispeed magnetic recording/playback devices.
It is a further object of the invention to provide an amplitude and phase equalizer having the above-indicated features and reduced manufacturing cost.



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