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Linear Integrated Systems A Leader in Precision Small Signal Discrete Semiconductors

Linear Systems is a designer, manufacturer and seller of precision, high-performance, small-signal discrete semiconductors. A Silicon Valley company founded in 1987, it produces ultra-low-noise, monolithic dual and single JFETs and bipolar transistors, along with high-speed DMOS switches, small-signal MOSFETs, ultra-low leakage diodes and BiFET amplifiers. These parts have been designed into world-class products in the areas of: Test & Measurement, Audio, Scientific Optical, Military Sensor; Industrial Controls; and Hybrids.

New on the Linear Systems blog: The Hidden Decision in Every JFET Circuit — Setting the Operating Point. Learn why biasi...
10/23/2026

New on the Linear Systems blog: The Hidden Decision in Every JFET Circuit — Setting the Operating Point. Learn why biasing (not just the device) determines gain, noise, linearity, output impedance and more — and get practical tips for choosing the right operating point for your designs. Read the full post: https://wix.to/X8Xyo0k

The same JFET can deliver excellent performance in one circuit—and disappoint in another.The difference may not be the device itself.It may be the operating point.A JFET’s datasheet describes what the device can do under specified conditions. Biasing determines the drain current, terminal voltag...

Same JFET, different job — source follower vs. common-source amplifiers. Discover how the same transistor topology can b...
10/16/2026

Same JFET, different job — source follower vs. common-source amplifiers. Discover how the same transistor topology can be tuned for voltage gain or low-impedance buffering, and why that matters in low-noise preamps, sensor interfaces, audio, and precision analog systems. Read the full breakdown and practical tips in our latest blog post. https://wix.to/91KJxw4

A JFET can serve very different purposes depending on how it is connected.Place the output at the drain, and the device can provide voltage gain. Take the output from the source, and the same JFET can buffer a signal while presenting a lower impedance to the next stage.These two fundamental configur...

Inside Burning Amp 2026: celebrating the DIY audio community, creative builds, and engineering passion. Hear from builde...
10/15/2026

Inside Burning Amp 2026: celebrating the DIY audio community, creative builds, and engineering passion. Hear from builders, engineers, and audiophiles about custom speakers, inventive amplifiers, and hands-on innovation. Read more: https://wix.to/tNwF8TT

What happens when passionate audio enthusiasts, talented engineers, and creative builders come together? Some truly fascinating conversations!Linear Systems' Paul Norton attended Burning Amp 2026, connecting with members of the DIY audio community to learn about their projects, innovative designs, a...

JFET Design Spotlight: Keeping It Simple Whenever We Can — sometimes the best analog solutions are the simplest. Discove...
10/14/2026

JFET Design Spotlight: Keeping It Simple Whenever We Can — sometimes the best analog solutions are the simplest. Discover how a low-noise, high-gain differential amplifier can deliver excellent linearity, wide bandwidth, and fast transient response without feedback. Read the full breakdown and design notes: https://wix.to/CcNbrrM

Sometimes the most effective analog solutions are also the simplest. This design demonstrates how a low-noise, high-gain differential amplifier can deliver excellent linearity, wide bandwidth, and fast transient response without feedback. “The sensing and manipulation of differential signals can t...

New on the Linear Systems Learning Series: Understanding Gate Leakage — why tiny JFET gate currents (pA–nA) matter in hi...
10/07/2026

New on the Linear Systems Learning Series: Understanding Gate Leakage — why tiny JFET gate currents (pA–nA) matter in high‑impedance circuits and how they can introduce measurable errors. Learn practical tips for measuring and mitigating gate leakage in precision analog designs. Read more: https://wix.to/PGYohis

When engineers evaluate a JFET, specifications such as noise, transconductance, input capacitance, and IDSS often receive most of the attention. But in high-impedance circuits, another specification can become extremely important: gate leakage current.JFET gate current may be extraordinarily small,....

Discover why complementary JFETs matter for truly balanced, low-noise designs. In our latest blog, we explain how pairin...
09/30/2026

Discover why complementary JFETs matter for truly balanced, low-noise designs. In our latest blog, we explain how pairing N‑channel and P‑channel JFETs simplifies biasing, improves drive capability and enables more symmetric signal handling — perfect for amplifiers, sensor interfaces and pro audio. Read the full post: https://wix.to/r7IWGYZ

Most discussions about JFETs focus on N-channel devices.That makes sense. N-channel JFETs are widely used in low-noise amplifiers, sensor interfaces, instrumentation inputs and professional audio equipment. But N-channel devices represent only one side of what is possible.When N-channel and P-channe...

How low is low? A JFET datasheet’s voltage-noise number can hide a lot — measurement setup, frequency, and whether the v...
09/25/2026

How low is low? A JFET datasheet’s voltage-noise number can hide a lot — measurement setup, frequency, and whether the value is typical or guaranteed all change the story. Our latest post breaks down how JFET noise is measured and why those test details matter for real-world designs. Read more: https://wix.to/VpuCtiV

A JFET datasheet may list an impressively low voltage-noise number—but how was that number measured, at what frequency, and does it represent a typical value or a guaranteed maximum?Those details matter.At nanovolt-per-root-hertz levels, the measurement system, test conditions and specification me...

Discover a clever analog trick: using complementary N- and P-channel JFETs to create a negative resistance effect. Perfe...
09/24/2026

Discover a clever analog trick: using complementary N- and P-channel JFETs to create a negative resistance effect. Perfect for curious circuit designers and anyone into oscillator or amplifier innovation. Read the full Design Spotlight to see the concept, circuit ideas, and applications. https://wix.to/dOn8z50

JFETs are commonly used in amplifiers, current sources, variable resistors, and oscillators, but sometimes the most interesting designs come from using them in ways you wouldn’t normally expect.This week’s Design Spotlight explores one of those “odd uses”: creating a negative resistance effe...

SD5400 now in a compact QFN-16 package — more design flexibility with less board space. The SD5400 quad analog switch in...
09/23/2026

SD5400 now in a compact QFN-16 package — more design flexibility with less board space. The SD5400 quad analog switch integrates four independent, bidirectional SPST switches with low on-resistance, low interelectrode capacitance, and fast switching — ideal for space-constrained, high-speed analog applications. Read more: https://wix.to/1vOYB5z

More design flexibility. Less board space.Linear Systems has expanded the SD5400 quad analog switch family with a new compact 3 × 3 mm QFN-16 package—giving designers another surface-mount option for space-constrained, high-speed analog applications.The SD5400 integrates four independent, bidirec...

Dive into our latest Design Spotlight: a high-Z JFET preamp tailored for low-level piezo sensing — now with more gain an...
09/18/2026

Dive into our latest Design Spotlight: a high-Z JFET preamp tailored for low-level piezo sensing — now with more gain and a 1.3 MHz bandwidth. Learn how an LSK389 differential pair, LS310 transistor pair and precision discrete components come together to deliver low-noise, high-performance analog sensing. Read the full breakdown and schematics: https://wix.to/dBSZ2h6

This week’s Design Spotlight is another great example of how JFETs and precision discrete components can come together to solve demanding analog design challenges. “Though there was another Piezo sensor earlier, this one has a bit more gain and a design bandwidth of 1.3 MHz. This circuit uses, a...

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