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POLE ZERO CANCELLATION CIRCUIT [1 record]
Record 1 - internal organization data 2012-01-09
Record 1, English
Record 1, Subject field(s)
- Amplifiers (Electronics)
- Radiological Physics (Theory and Application)
Record 1, Main entry term, English
- pole-zero cancellation circuit
1, record 1, English, %20pole%2Dzero%20cancellation%20circuit
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
Pole-zero cancellation (Tail cancellation) … we approximated the preamp output pulse as a step function, however, in a real preamp pulse, the falling tail is a long exponential decay instead of a simple step function. Consequently, there is a small amplitude undershoot starting at about 7τ. This undershoot decays back to baseline with the long time constant of the preamplifier. At medium to high counting rates, a substantial fraction of the amplifier output pulses will ride on the undershoot from a previous pulse. The apparent pulse amplitudes measured for these pulses will be significantly lower, which deteriorates the energy resolution. Most shaping amplifiers incorporate a pole-zero cancellation circuit to eliminate this undershoot. The benefit of pole-zero cancellation is improved peak shapes and resolution in the energy spectrum at high counting rates. 1, record 1, English, - %20pole%2Dzero%20cancellation%20circuit
Record 1, Key term(s)
- pole zero cancellation circuit
Record 1, French
Record 1, Domaine(s)
- Amplificateurs (Électronique)
- Physique radiologique et applications
Record 1, Main entry term, French
- circuit de compensation du passage à zéro
1, record 1, French, circuit%20de%20compensation%20du%20passage%20%C3%A0%20z%C3%A9ro
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Circuit de compensation du passage à zéro (PZC : Pole Zero Cancellation) : parce que le signal d’entrée n’est pas rigoureusement un signal marche mais décroît lentement, le signal unipolaire va couper la ligne de base puis regagner celle-ci avec les constantes de temps du préamplificateur (des ms [millisecondes]). Au lieu de partir de la ligne de base, un signal va donc débuter sur la queue d’un signal précédent, c’est-à-dire sur une valeur légèrement négative. Son amplitude mesurée par rapport à la ligne de base est un peu trop faible et cela va se traduire par un élargissement des pics du côté des basses énergies. 1, record 1, French, - circuit%20de%20compensation%20du%20passage%20%C3%A0%20z%C3%A9ro
Record 1, Spanish
Record 1, Textual support, Spanish
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