Latest Filters Articles and Videos

Knowles SFSWG & SFSWR EMI Panel Filters provide reliable EMI suppression and environmental protection for demanding…

Knowles SFSWG & SFSWR EMI Panel Filters provide reliable EMI suppression and environmental protection for demanding electronic systems. Watch and learn all about their features, specs, applications, and more!

Interference in FM grows stronger with frequency offset, until pre-emphasis flattens the curve. See why a signal just…

Interference in FM grows stronger with frequency offset, until pre-emphasis flattens the curve. See why a signal just twice as strong as a rival broadcast can completely capture the channel.

This article describes a non-contact liquid level sensor using fringing field capacitance with the AnalogPAK IC, using…

This article describes a non-contact liquid level sensor using fringing field capacitance with the AnalogPAK IC, using Math Core calibration for improved stability.

Pre-emphasis and de-emphasis boost noise performance in FM, but only up to a point—push the gain too far and you risk…

Pre-emphasis and de-emphasis boost noise performance in FM, but only up to a point—push the gain too far and you risk overmodulation.

Vishay EMIF-1S1P-481N EMI Filter Reference Design provides a flexible, ready-to-test platform for developing and…

Vishay EMIF-1S1P-481N EMI Filter Reference Design provides a flexible, ready-to-test platform for developing and optimizing single-phase, single-stage EMI filters. Watch and learn all about their features, specs, applications, and more!

Simple first-order pre-emphasis and de-emphasis filters can boost FM receiver SNR by more than 13 dB by exploiting the…

Simple first-order pre-emphasis and de-emphasis filters can boost FM receiver SNR by more than 13 dB by exploiting the spectral differences between signal and noise.

Worked examples quantify just how much the FMFB loop shrinks noise bandwidth. We also show how the PLL demodulator offers…

Worked examples quantify just how much the FMFB loop shrinks noise bandwidth. We also show how the PLL demodulator offers a simpler alternative for reducing threshold.

While feedback lowers the FM detection threshold, it offers no noise advantage over conventional receivers when the…

While feedback lowers the FM detection threshold, it offers no noise advantage over conventional receivers when the carrier power is strong. Discover why in this discussion and mathematical analysis.

The new devices provide compact C-band filtering options for 5G RF front-end designs from 3,300 MHz to 5,000 MHz.

The new devices provide compact C-band filtering options for 5G RF front-end designs from 3,300 MHz to 5,000 MHz.

The Nancy Grace Roman Space Telescope’s mirror may get the headlines, but its detector chips, photon-counting cameras,…

The Nancy Grace Roman Space Telescope’s mirror may get the headlines, but its detector chips, photon-counting cameras, and downlink amplifier tell the electronics story.

By closing a feedback loop around the demodulator, the FMFB architecture narrows the noise bandwidth and lowers the FM…

By closing a feedback loop around the demodulator, the FMFB architecture narrows the noise bandwidth and lowers the FM threshold, without improving SNR at high CNR.

Working through examples shows how the threshold effect reshapes FM design choices. See how ignoring it can undershoot…

Working through examples shows how the threshold effect reshapes FM design choices. See how ignoring it can undershoot the required carrier power by over 5x for the same target SNR.

The standard FM SNR equation breaks down once the carrier-to-noise ratio drops below a critical threshold, revealing a…

The standard FM SNR equation breaks down once the carrier-to-noise ratio drops below a critical threshold, revealing a hard limit on trading bandwidth for noise performance.

Deriving a general signal-to-noise expression for frequency modulation with any message signal reveals a core trade-off:…

Deriving a general signal-to-noise expression for frequency modulation with any message signal reveals a core trade-off: more deviation buys better noise performance, but only by using more bandwidth.

This article explores how combining signal and noise power reveals how the FM system’s output SNR scales with carrier…

This article explores how combining signal and noise power reveals how the FM system’s output SNR scales with carrier amplitude and modulation index.

Bob Yannes built a three-voice analog synthesizer onto one die in 1982, and its imperfect filter became the signature…

Bob Yannes built a three-voice analog synthesizer onto one die in 1982, and its imperfect filter became the signature sound of an era.

Explore how frequency-modulated waves resist interference. We break down the demodulator architecture and derive the…

Explore how frequency-modulated waves resist interference. We break down the demodulator architecture and derive the exact output signal power for a sinusoidal message.

Envelope detection is simple, but that simplicity has a noise-performance cost. Here’s how much SNR conventional AM…

Envelope detection is simple, but that simplicity has a noise-performance cost. Here’s how much SNR conventional AM gives up compared to its coherent counterparts.

Using a graphical approach, we show that coherent SSB demodulation leaves the input and output SNR unchanged, then…

Using a graphical approach, we show that coherent SSB demodulation leaves the input and output SNR unchanged, then compare its noise performance to DSB-SC and baseband systems.