| Author | Message | | | eric | | Posted: Fri Sep 01, 2006 12:42 pm Post subject: High-current, high-speed buffer | | | | Site Admin Joined: 01 Jan 1970 Posts: 311 | T. Giesberts
The circuit shown in the diagram is intended for applications in
which relatively large pulse-shaped signals are to be applied to a
standard impedance of, say, 50 Ω. The parallel circuit of two highspeed
buffers prevents overheating during periods of high loads
and high drive.
The operational amplifiers used, Analog Devices’ Type
BUF104, have a bandwidth of 110 MHz and a very high slew rate:
3000 V μs–1. The peak output current is 65 mA, which is not sufficient
to provide 5 V into 50 Ω, but the parallel combination is
able to. Connecting 100 Ω resistors, R3 and R4, in series with the
outputs of the op amps gives an overall output impedance of 50 Ω.
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