High-Z buffer amplifier has 3GHz bandwidth

High-Z buffer amplifier has 3GHz bandwidth

New Products |
Texas Instruments has introduced what it claims is the world's widest-bandwidth high-input-impedance (Hi-Z) buffer amplifier, capable of supporting frequency bandwidths as high as 3GHz.
By Nick Flaherty


The company said use of the IC would save test and measurement engineers months of design time by eliminating the need for custom ASICs and by simplifying front-end designs.

The BUF802 has reduced input settling time and allows higher signal throughput and the device is suitable for application in test and measurement applications including oscilloscopes, active probes and high-frequency data-acquisition systems.

The bandwidth achieved by the BUF802 was previously only possible by using application-specific integrated circuits (ASICs), TI said. Previous alternatives to ASICs required dozens of discrete field-effect transistors (FETs), protection diodes and transistors.

The BUF802 provides 10x wider bandwidth than FET-input amplifiers, matching the performance of custom ASICs. It also enables quiescent current adjustment for a range of bandwidth and signal swing requirements, from 100MHz to 3GHz at 1V peak to peak (VPP) and as high as 2GHz at 2VPP.

Integrated functional modes allow engineers to use the BUF802 as a standalone buffer or in a composite loop with a precision amplifier such as the OPA140.

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

The BUF802 is available for purchase on TI.com in a 3-mm-by-3-mm 16-pin very thin no-lead (VQFN) package, and is priced at US$1.80 in 1,000-unit quantities. The BUF802RGTEVM evaluation module is available on TI.com for US$25.

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