If we replace the potentiometer VR1 with an AC signal plus DC bias signal in any of the previous Figures 3 to 17, the voltage controlled attenuators can become an amplitude modulator circuit instead.

An example of AM is the violinist's tremolo, where the amplitude of the vibrating string is rapidly altered by a movement of the bow. See also: Beats. Compare: Frequency Modulation, Pulse, Vibrato. In ...

For a more analog MOSFET application, consider this simple AM modulator. Figure 4 MOSFET amplitude modulator The circuit consists of an N-channel MOSFET, two resistors, and a Schottky diode. The ...

Abstract: A configurable modulator is demonstrated, implemented as a silicon Mach-Zehnder interferometer with a plasma dispersion modulator and tunable couplers. The configurable modulator can work as ...

AM, or amplitude modulation, was the earliest way of sending voice over radio waves. That makes sense because it is easy to modulate a signal and easy to demodulate it, as well.

This paper presents a novel technique of amplitude modulation which is based on a second-order oscillator circuit. By using the multi-time technique to analyze a second-order system for time-varying ...

• Providing an interferometric optical modulator which can be utilized as a digital photonic clock circuit, a pulse width/amplitude modulator circuit, and a bi-stable optical-memory cell circuit. • ...

Modulation mechanism and transistor characteristics The basic modulation techniques map the information by varying up to three different parameters (amplitude, frequency and phase) of the carrier ...

M-QAM uses a combination of both amplitude and phase to represent multiple-bit words. One popular modulation scheme, QPSK, transmits two bits per symbol. This is also known as 4-QAM.

The depth of modulation in the signal shown is 100%. An amplitude modulated signal (below) where the frequency ratio of the carrier and modulating signals (above) is 10:1. Sound Example: AM signal ...