Fast op. amp. [Renesas EL5104, Analog Devices AD9631-2] Fast opamp - PowerPoint PPT Presentation

Fast op. amp. [Renesas EL5104, Analog Devices AD9631-2]

Fast opamp  The EL5104, EL5105, EL5204, EL5205, and EL5304 are high-speed voltage feedback amplifiers based on the current feedback amplifier architecture.  This gives the typical high slew rate benefits of a CFA family along with the stability and ease of use associated with the VFA type architecture.

EL5104 • Specified for 5 V or ±5 V applications • -3dB bandwidth = 700 MHz • ±0.1dB bandwidth = 45 MHz • low supply current = 9.5 mA • slew rate = 7000 V/µs

AD9631 and AD9632  The AD9631 and AD9632 are very high speed and wide bandwidth amplifiers.  settling 16 ns to 0.01%, 2 V step  unlike a traditional voltage feedback amplifier, where the slew speed is dictated by its front end dc quiescent current and gain bandwidth product, they provide “on - demand” current that increases proportionally to the input “step” signal amplitude ->  slew rates (1300 V/us) comparable to wideband current feedback designs.  AD9631: G = +1, AD9632: G = +2  “The value of the feedback resistor is critical for optimum performance on the AD9631 (gain of +1) and less critical as the gain increases”

 “The AD9631 and AD9632 have been designed to offer outstanding performance as video line drivers” Note the bypass capacitors on the power supply!