BUF802 High-Speed Operational Amplifier Texas Instruments BUF802 High-Speed Operational Amplifier is an open-loop, unity gain buffer with a JFET-input stage that offers low-noise, high-impedance buffering for data acquisition system (DAQ) front-ends. The BUF802 supports DC to 3.1GHz of bandwidth while providing excellent distortion and noise performance across the frequency range.