Buffer amplifier increases signal bandwidth by 10×

Texas Instruments Inc. (TI) has claimed the industry’s widest-bandwidth high-input-impedance (Hi-Z) buffer Amplifier that can support frequency bandwidths up to 3 GHz. Reporting a 10× increase in signal bandwidth in data-acquisition systems, the wider bandwidth and high slew rates of the BUF802 enable higher signal throughput and minimal input settling time. This enables designers to measure higher-frequency signals more accurately in test and measurement applications including oscilloscopes, active probes and high-frequency data-acquisition systems, said TI.

The bandwidth achieved by the BUF802 was previously only possible by using application-specific integrated circuits (ASICs), said TI. By eliminating the ASICs and simplifying the front-end designs by using the BUF802, designers can achieve a wide dynamic range “at a fraction of the cost,” said the company.

In addition, previous alternatives to ASIC-based design implementations required dozens of discrete components such as field-effect transistors (FETs), protection diodes and transistors, which added cost and system complexity and did not deliver the same bandwidth of ASICs, said TI.

Buffer amplifier increases signal bandwidth by 10×

Click for a larger image. (Source: Texas Instruments Inc.)

The BUF802 is called a single-chip alternative to ASICs or FET-input amplifier-based implementations. TI said the new solution integrates the features of discrete components and provides 10 times wider bandwidth than FET-input amplifiers, matching the performance of custom ASICs.

The BUF802 is reportedly the industry’s first buffer to enable quiescent current adjustment for a wide range of bandwidth and signal swing requirements, from 100 MHz to 3 GHz at 1-V peak to peak (VPP) and as high as 2 GHz at 2 VPP. This enables designers to scale their front-end designs across multiple data-acquisition applications.

In addition, the BUF802 can be used as a standalone buffer or in a composite loop with a precision amplifier like the OPA140 thanks to the integrated functional modes.

“As a stand-alone buffer, the BUF802 can help achieve high input impedance and high slew rates in applications that can tolerate 100-mV offsets or where the signal chain is AC-coupled,” said TI. “In a composite loop, the new buffer can achieve high DC precision and 3-GHz bandwidth in applications requiring 1 μV/°C maximum offset drift.”

Buffer amplifier increases signal bandwidth by 10×

TI BUF802 schematic (CL mode). Click for a larger image. (Source: Texas Instruments Inc.)

The BUF802, housed in a 3 × 3-mm, 16-pin VQFN package, is available for purchase ON TI.com and is priced at $1.80 in quantities of 1,000. The BUF802RGTEVM evaluation module is available on TI.com for $25. Click here for additional resources and the reference design “Flexible 3.2-GSPS multi-channel AFE reference design for DSOs, radar and 5G wireless test systems.”


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