What does a constant fraction discriminator do?
The constant-fraction discriminator incorporates a timing discriminator that triggers on the zero-crossing, thus providing a time marker at the optimum fraction of pulse height. Since the time of zero-crossing is independent of pulse amplitude, the constant-fraction discriminator delivers virtually zero walk.
What is a discriminator in electronics?
[di′skrim·ə‚nād·ər] (electronics) A circuit in which magnitude and polarity of the output voltage depend on how an input signal differs from a standard or from another signal.
What do you mean by voltage discriminator how it works?
In this discriminator the input signal is processed by a peak-crossing circuit which produces a bipolar pulse having its zero-crossing point at the peak of the input signal. All essential functions in the discriminator are performed by means of tunnel diodes with backward diodes as nonlinear loads.
What is time walk in electronics?
Time walk is the temporal shift of the output pulse of the SPCM module and is mainly due to the effects of avalanche diode self-heating at higher count rates and to a lesser extent, the electronics around the SPAD.
What is constant fraction?
A constant fraction discriminator (CFD) is an electronic signal processing device, designed to mimic the mathematical operation of finding a maximum of a pulse by finding the zero of its slope. Some signals do not have a sharp maximum, but short rise times .
How does a discriminator work?
The discriminator in a GAN is simply a classifier. It tries to distinguish real data from the data created by the generator. It could use any network architecture appropriate to the type of data it’s classifying.
What is a balanced discriminator?
The balanced optical discriminator can be used as part of a phase modulated optical communications system which will have certain advantages over intensity modulated systems. An alternative to discrimination at optical frequencies is discrimination at some intermediate frequency as is done in microwave carrier systems.
How does frequency discriminator work?
A frequency discriminator is defined as a converter of frequency changes into amplitude changes. Discriminators are used in various applications, one of which is the direct demodulation of fre- quency modulated signals [1, 2]. Mixing a broad- band signal down to an intermediate frequency, can be a tedious job.
What is meant by discriminator?
: one that discriminates especially : a circuit that can be adjusted to accept or reject signals of different characteristics (such as amplitude or frequency)
Can a fraction be a constant term?
A number of closed-form constants can be obtained for generalized continued fractions having particularly simple partial numerators and denominators. of the constant are 0, 1, 2/3, 7/10, 30/43, 157/225, 972/1393, 6961/9976.
What is a frequency discriminator?
What is the role of discriminator?
How does a constant fraction discriminator work?
Constant Fraction Discriminators (CFDs) use a constant fraction (or percentage) of the input pulse to precisely determine the timing of the output pulse leading edge relative to the input signal. This technique is not subject to jitter (Òtime walkÓ) caused by varying amplitudes of the inputs, such as in leading edge discriminators.
Which is a constant fraction discriminator in Camac?
OVERVIEWThe LeCroy Model 3420* is a 16-input Constant Fraction Discriminator in a single-width CAMAC module. Constant Fraction Discriminators (CFDs) use a constant fraction (or percentage) of the input pulse to precisely determine the timing of the output pulse leading edge relative to the input signal.
How is a constant fraction discriminator used in FM demodulator?
The output of both comparators is fed through an AND gate. A discriminator without that constant fraction would just be a comparator. Therefore the word discriminator is used for something different (namely for an FM- demodulator ).
What is the purpose of a discriminator function?
The purpose of a discriminator is to decide when the input is something you are interested in. It does this by putting out a logic pulse whentheinputsignalmeetsanadjustablethresholdvalue. Alldiscriminators fall into one of two categories, leading edge or constant fraction.