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Pulse Amplitude Filter

IP.com Disclosure Number: IPCOM000096188D
Original Publication Date: 1963-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Miranker, WL: AUTHOR [+2]

Abstract

In a series of pulses of a given shape, the filter discriminates pulses having an amplitude within a preselected passband of defined width.

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Pulse Amplitude Filter

In a series of pulses of a given shape, the filter discriminates pulses having an amplitude within a preselected passband of defined width.

Input pulses A, fed to input 10, are transformed into ramp voltages B by integrator 11. The slope of ramp voltages B is proportional to the amplitude of input pulses A. Signals B are compared with a given D. C. level in discriminator
12. This delivers an output pulse C at the instant when the ramp voltage B reaches the threshold.

Time selectivity after integration is provided in order to obtain amplitude selectivity. Trigger pulse T, applied to input 15, in synchronism with signal A is delayed by a fixed amount t in delay device 16. Gate generator 17 is triggered by the delayed pulse and produces rectangular pulse D which opens gate 14 for pulse C. Whenever pulse C lies within the duration of pulse D and only then, an output pulse E occurs. At terminal 13 of discriminator 12, the D.

C. level is set. This level, because of the fixed delay t, defines the center amplitude of the pulses to be transferred. The width of rectangular pulse D delivered by generator 17 is influenced at terminal 18. The passband, i.e., the range of amplitudes of the pulses passed through the filter, is varied according to the duration of pulse D.

The functions of integrator 11 and discriminator 12 are performed by a circuit which has an inductance 21 integrating the pulses applied to input 20, a biased tunnel diode 22, and a peaki...