A novel full-wave rectifier turns an audio power amplifier into a simple modulator, that is then used to modulate an ...

Envelope tracking technology is a well-known method of improving the efficiency of RF amplifiers operating with rapidly varying signal amplitude. The voltage source in an envelope tracking system is ...

Common digital modulation techniques include amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK). ASK is the simplest of these techniques, and is used for low ...

PSK is another modulation scheme that maps information symbols onto a transmitted carrier signal. With this scheme, however, the symbols are distributed onto a constellation that forms a circle, i.e., ...

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.

• 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. • ...

Finally, there's frequency modulation (FM). FM is similar to AM, but the frequency of the carrier is modulated rather than the amplitude, producing a sound that's rich with additional harmonics not ...

Nature 427, 615–618 (2004) Article ADS CAS PubMed Google Scholar Liao, L. et al. High speed silicon Mach-Zehnder modulator. Opt. Express 13, 3129–3135 (2005) Article ADS CAS PubMed Google Scholar ...

The web is filled with introductions to Delta Sigma modulation (also sometimes referred to as Sigma Delta modulation) in the context of Delta Sigma converters. Unfortunately, the ones I’ve ...