In this article, we introduce the basic principles of phase modulation (PM) and use example waveforms to clarify the often-confusing relationship between the PM…
In this article, we introduce the basic principles of phase modulation (PM) and use example waveforms to clarify the often-confusing relationship between the PM wave and the message signal.
Using graphical representations to support our mathematical analysis, we walk through the process of how the Weaver…
Using graphical representations to support our mathematical analysis, we walk through the process of how the Weaver modulator transforms the signal frequency spectrum.
Gain compression causes power systems to transition from linear to nonlinear operation. Learn how the 1 dB compression…
Gain compression causes power systems to transition from linear to nonlinear operation. Learn how the 1 dB compression point is used to define the limits of linear operation.
Learn about the Weaver modulator, an RF circuit that improves on older forms of SSB modulation by removing the need for…
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.
The output of a power amplifier can be a function of both present and past input values. In this article, we explore how…
The output of a power amplifier can be a function of both present and past input values. In this article, we explore how to characterize this important non-ideality.
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.
We discuss the basics of implementing digital predistortion in RF power amplifier systems and explore two popular…
We discuss the basics of implementing digital predistortion in RF power amplifier systems and explore two popular techniques based on look-up tables.
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.
We explore the basic concepts of analog predistortion for linearizing RF amplifiers and review some common implementations.
We explore the basic concepts of analog predistortion for linearizing RF amplifiers and review some common implementations.
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.
Learn about an important design technique for high-power RF transmitters: feed-forward linearization, which operates on…
Learn about an important design technique for high-power RF transmitters: feed-forward linearization, which operates on the principle of distortion signal cancellation.
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.
We explore the implementation and design equations of the second-harmonic peaking amplifier.
We explore the implementation and design equations of the second-harmonic peaking amplifier.
We use a Raspberry Pi and free software to build a test platform for IoT systems.
We use a Raspberry Pi and free software to build a test platform for IoT systems.
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.
In Part 2 of this two-part series, we turn our hardware assembly into a functioning soundboard by adding the necessary…
In Part 2 of this two-part series, we turn our hardware assembly into a functioning soundboard by adding the necessary code in Arduino IDE and uploading soundbites.
Using the second-harmonic peaking amplifier as an example, we explore the basic principles of inverse Class F amplification.
Using the second-harmonic peaking amplifier as an example, we explore the basic principles of inverse Class F amplification.
Learn how to turn an ATmega328 microcontroller and an assortment of readily available parts into a dedicated hardware soundboard.
Learn how to turn an ATmega328 microcontroller and an assortment of readily available parts into a dedicated hardware soundboard.
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.
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