Learn about the Weaver modulator, an RF circuit that improves on older forms of SSB modulation by removing the need for either sharp bandpass filters or…
Learn about the Weaver modulator, an RF circuit that improves on older forms of SSB modulation by removing the need for either sharp bandpass filters or quadrature phase shifters.
Using phasors, we explore how real-valued bandpass signals are represented as complex baseband signals in the models used…
Using phasors, we explore how real-valued bandpass signals are represented as complex baseband signals in the models used by RF communication systems.
This article uses 3D models of the frequency spectrum to demystify the complex mathematical concepts, such as the Hilbert…
This article uses 3D models of the frequency spectrum to demystify the complex mathematical concepts, such as the Hilbert transform and the shifting property, that make the phasing method possible.
SSB modulation improves bandwidth efficiency by eliminating either the upper or lower sideband. Learn about the circuits…
SSB modulation improves bandwidth efficiency by eliminating either the upper or lower sideband. Learn about the circuits and mathematics that make this possible without the use of sharp filters.
Learn about a classic amplitude modulation (AM) technique that’s been used in voice transmission for nearly a century.
Learn about a classic amplitude modulation (AM) technique that’s been used in voice transmission for nearly a century.
We examine RF demodulation circuits used for both double-sideband suppressed carrier (DSB-SC) signals and double-sideband…
We examine RF demodulation circuits used for both double-sideband suppressed carrier (DSB-SC) signals and double-sideband signals with a carrier.
This article highlights a selection of circuits used for amplitude modulation, including a switching modulator built with…
This article highlights a selection of circuits used for amplitude modulation, including a switching modulator built with just one diode and a circuit that incorporates a Class C power amplifier.
Among modulator circuits, the ring modulator stands out as one of the most effective for generating AM signals. Learn why…
Among modulator circuits, the ring modulator stands out as one of the most effective for generating AM signals. Learn why in this article.
Using the example of a diode-bridge modulator, we examine the basic principles of switching modulators for AM signal generation.
Using the example of a diode-bridge modulator, we examine the basic principles of switching modulators for AM signal generation.
Learn how the balanced modulator addresses shortcomings of the square-law modulator when generating DSB-SC and…
Learn how the balanced modulator addresses shortcomings of the square-law modulator when generating DSB-SC and conventional AM signals.
In this article, we explore the foundational concepts of square-law modulators and examine some circuit implementations.
In this article, we explore the foundational concepts of square-law modulators and examine some circuit implementations.
Learn about conventional AM, an amplitude modulation technique commonly used in commercial radio broadcasting.
Learn about conventional AM, an amplitude modulation technique commonly used in commercial radio broadcasting.
Learn about the advantages and disadvantages of DSB-SC amplitude modulation.
Learn about the advantages and disadvantages of DSB-SC amplitude modulation.
In this article, we discuss the basics of RF modulation and how it affects the performance of communication systems.
In this article, we discuss the basics of RF modulation and how it affects the performance of communication systems.
The receiver in a digital PAM system must sample and measure the amplitude of a signal that is affected by the frequency…
The receiver in a digital PAM system must sample and measure the amplitude of a signal that is affected by the frequency response of the transmission channel.
An encoding technique used for digital communication, pulse amplitude modulation (PAM) converts a discrete-time signal…
An encoding technique used for digital communication, pulse amplitude modulation (PAM) converts a discrete-time signal into a variable-amplitude continuous-time signal that is suitable for high-speed wired communication systems.
Quadrature networks convert a single input signal into two outputs with a 90-degree phase difference. This article…
Quadrature networks convert a single input signal into two outputs with a 90-degree phase difference. This article explains how to design quadrature networks using all-pass filters.
Learn about digital square wave generators using a ring oscillator, a 555 timer-based oscillator, and an…
Learn about digital square wave generators using a ring oscillator, a 555 timer-based oscillator, and an Arduino-generated square wave oscillator.
Learn about the role of non-overlapping or complementary pulse width modulation (PMW) in DC motor control using an…
Learn about the role of non-overlapping or complementary pulse width modulation (PMW) in DC motor control using an h-bridge circuit, taking into consideration PWM shoot-through and dead-time PWM.
In this article, get a basic understanding of wireless communication networks—LoRa and LoRaWAN.
In this article, get a basic understanding of wireless communication networks—LoRa and LoRaWAN.
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