Get Pulse Amplitude Modulation Circuit

A PAM is generated from a pure sine wave modulating signal and a square wave generator which produces the carrier pulse and a PAM modulator circuit. A sine wave generator is used which is based on the Wien Bridge Oscillator circuit. This can produce distortion less sine wave at the output.

Pulse-amplitude modulation (PAM) is a form of signal modulation where the message information is encoded in the amplitude of a series of signal pulses. It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied ing to the sample value of the message signal.

y = pammod( x , M ) returns the complex envelope of the modulation of the input message signal, x , using PAM and the alphabet size, M . y = pammod( x , M , initphase ) specifies the initial phase of the modulated signal.

Pulse amplitude modulation is defined as the data transmission by altering the amplitudes (power levels or voltage) of every pulse in a regular time sequence of electromagnetic pulses. The possible number of amplitudes can be infinite, but mostly it is some power of two so that the final output signal can be digital.

Circuit Design: Pulse Amplitude Modulation DESCRIPTION: { 1) Variable frequency sine wave generator. { 2) SQUARE WAVE GENERATOR. 3) PAM MODULATOR.

The PAM fluorometry principle is based on a 1 μs pulse of light (low intensity, non-actinic) that is synchronized to a lock-in amplifier. This allows effective quantum yield determinations to be performed in (sun) light, as the lock-in amplifier removes all signal not associated with the lock-in signal.

1 is used to produce Flat top sampled PAM. The working principle of this circuit is quite easy. The sample and Hold (S/H) circuit consists of two field effect transistors (FET) switches and a capacitor. The sampling switch is closed for a short duration by a short pulse applied to the gate G1 of the transistor.