ad5539jq Analog Devices, Inc., ad5539jq Datasheet - Page 12

• Manufacturer Part Number: ad5539jq
• Description: Ultrahigh Frequency Operational Amplifier
• Manufacturer: Analog Devices, Inc.

AD5539
Figure 35. Differential Gain and Phase Measurement
Circuit
Figure 36. Differential Gain and Phase Test Setup
Figure 37. Differential Gain vs. Ramp Amplitude
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MEASURING AD5539 SETTLING TIME
Measuring the very rapid settling times associated with AD5539
can be a real problem for the designer; proper component layout
must be used and appropriate test equipment selected. In addi-
tion, both cable dispersion (a function of cable losses) and the
quality of termination (SWR) directly affect the measurement.
The circuit of Figure 39 was used to make a “brute force”
AD5539 settling time measurement. The fixture containing the
circuit was connected directly—using a male BNC connector
(but no cable)—onto the front of a 50
preamp. A digital mainframe was then used to capture, average,
and expand the error signal. Most of the small-scale waveform
aberrations shown on the figure were caused by the oscilloscope
itself, especially the glitch at 15 ns. The pulse source used for
this measurement was an EH-SPG2000 pulse generator set for a
1 ns rise-time; it was coupled directly to the circuit using 18" of
microwave 50
Figure 38. Differential Phase vs. Ramp Amplitude
Figure 39. AD5539 Settling Time Test Circuit
hard line.
input oscilloscope
REV. B