Linear Integrated Systems

JFET vs. MOSFET — which is best for precision analog? Dive into our quick breakdown on noise, input impedance, linearity and where each FET shines. Perfect for analog front-end designers and hobbyists wanting better performance. Read more: https://wix.to/MtfQPXo

JFET vs. MOSFET: Choosing the Right Technology for Precision Analog Applications Field-effect transistors are foundational building blocks in modern electronics, but not all FETs are optimized for the same tasks.While MOSFETs dominate digital circuits, power management, and switching applications, JFETs continue to play a critical role in low-noise, high-impedance analog front e...

Discover the evolution of JFET design — from early OCR machines to 45 years of FET innovation. Dive into the engineering stories, design challenges, and techniques that shaped modern sensor interfaces. Read more: https://wix.to/VIINx9p

JFET Design Spotlight 🔍 | From Early OCR Systems to 45 Years of FET Innovation "In 1979, we teamed up at DEST Corp. to design the first desktop OCR machine for scanning standard letter and legal pages with a linear Reticon stored-charge diode array.Internal to that sensor were two identical 2048-pixel diode strings. Light would deplete the diode pixel reset charge and be read....

⚡ When low noise isn't enough.

In many high-impedance sensor applications, input capacitance can be just as important as noise performance.

The LSK489 combines:

• 1.8 nV/√Hz typical noise voltage
• Industry-leading 4 pF typical input capacitance
• Monolithic dual JFET matching and thermal tracking
• Available in TO-71, SOIC-8, SOT-23, and DFN packages

Ideal for acoustic sensors, hydrophones, sonobuoys, wideband differential amplifiers, precision instrumentation, and other demanding front-end applications.

🎯 What high-impedance sensing challenges are you working on today?

High-impedance sensors (microphones, hydrophones, piezoelectric devices, MEMS) need more than just low noise. Input capacitance and front-end design choices can make or break signal integrity — especially with weak signals. Read our quick guide to what else matters and how to design for it: https://wix.to/G4H6raV

Why High-Impedance Sensors Need More Than Just Low Noise When engineers design front-end circuits for microphones, hydrophones, piezoelectric sensors, MEMS devices, and other high-impedance signal sources, noise is often the first specification they look at.And for good reason.Weak signals can easily be overwhelmed by amplifier noise, making low-noise dev...

JFET Design Spotlight: Maximum Power Point Test Controller — a dad-and-daughter project turned into a practical tool for testing solar panels under real-world conditions. Learn how JFETs are used in three distinct roles to optimize MPPT testing and why component choice matters for precision power measurements. Read the full post: https://wix.to/6lOmLOb

JFET Design Spotlight: Maximum Power Point Test Controller “My daughter, during her graduate studies in renewable energy applications, once needed a tester for solar panels to find their maximum power point under real-world conditions. So, this is what dads do. The resulting tester demonstrates how different semiconductors can be selected for highly speci...

New on the blog: Photodiode Preamps — why low input capacitance and low equivalent input noise matter for clean photodiode detection. Learn how device choices like the LSK489 dual FET (≈3 pF input capacitance) compare to typical JFET op amps and improve low-noise performance. Read more: https://wix.to/w85E7ns

Photodiode Preamps In some JFET op amps such as the AD743, the input capacitance is in the order of 18 to 20 pF. In comparison, with an LSK489 dual FET, the input capacitance is in the order of 3 pF, which will be suitable for low noise photodiode applications. In this section we will see why it is important to have l...

Better simulation starts with better device models. We’ve released updated SPICE models for the LSK389 covering A, B, C, and D grades — refined from real device characteristics so your simulations match real-world behavior more closely. Read how these improvements boost accuracy and streamline design: https://wix.to/hxHYCD8

Better Simulation Starts with Better Device Models 🔍 Accurate simulation depends on accurate models. That’s why we’ve released new SPICE models for the LSK389, now covering all A, B, C, and D grades. These updated models are derived from real device characteristics, with key parameters like VTO and β refined based on IDSS and transconductance. Th...

Detecting weak signals starts at the analog front end. Our latest blog dives into how precision components like the LSK389 dual JFET help modern sensing systems capture tiny signals in noisy environments. Read more: https://wix.to/zKDVSZp

JFET Design Spotlight: A Single JFET Phase Splitter for audio applications — Learn how a simple JFET circuit can create precise 0° and 180° phase splits for balanced outputs, transformers, and push-pull stages. Perfect for DIY audio designers and engineers wanting low offset and clean performance. Read more: https://wix.to/Svv9JaT

JFET Design Spotlight: A Single JFET Phase Splitter for audio applications “There is sound and then there is the sound of sound.”™ In designing discrete element electronic audio circuitry, there will inevitably be a need to split a signal to a 0° and 180° phase differential. Either to drive a balanced signal to a transformer, a line signal to an XLR connector, or a...

AI isn't just GPUs and CPUs — it's a whole semiconductor ecosystem that keeps systems reliable, fast, and synchronized. Discover how signal integrity, timing, and control chips enable real-world AI performance in our latest blog: The Hidden Role of Semiconductors in AI Infrastructure. Read more: https://wix.to/1lYsyIl

The Hidden Role of Semiconductors in AI Infrastructure When people talk about AI, the focus is almost always on GPUs, CPUs, and advanced nodes.But that’s only part of the story.Behind every AI system is a broader layer of semiconductors responsible for signal integrity, timing, and control — the functions that allow high-performance compute to actua...