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.

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 ...

Two things have been overlooked with phasing amplitude modulation. One is the importance of pulse modulation; the other is that logic gates can be used for analog signal processing. Both of these ...

• 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. • ...

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.

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.

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 ...

Potentiometer R7 adjusts the output amplitude as required by the modulator in use. The notch frequency is set by L2 and C2, and the notch depth and bandwidth are set by R4, R5, and R6.

News Release 17-Mar-2025 Spin-dependent amplitude and phase modulation with multifold interferences via single-layer diatomic all-silicon metasurfaces ...