THS3217 Datasheet, PDF (24/73 Pages) Texas Instruments – THS3217 DC to 800-MHz, Differential-to-Single-Ended, DAC Output Amplifier

THS3217
SBOS766B – FEBRUARY 2016 – REVISED FEBRUARY 2016
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8.3 Harmonic Distortion Measurement
The distortion plots for all stages used a filtered high-frequency function generator to generate a very low-
distortion input signal. The LMH3401 interface was used when testing the D2S and the full-signal path
(D2S+OPS) harmonic distortion performance. Running the filtered signal through the LMH3401, as shown in
Figure 70, provided adequate input signal purity because of the approximately –100-dBc harmonic distortion
performance through 100 MHz. In order to test the harmonic-distortion performance of the OPS and midscale
buffer, the configuration shown in Figure 71 was used.
Function
Generator
- ^<>
Output
50
Low Pass Filter
LMH3401 EVM
+_
±⁺
THS3217 EVM
IN+ ₊
±
IN-
I Input
Q Input
Ext Trig
Spectrum
Analyzer
RF
INPUT
50
High-Pass Filter
20dB
Attenuator
Figure 70. Harmonic-Distortion Measurement: D2S and Full-Path (D2S + OPS) Circuit Configurations
Function
Generator
- ^<>
Output
50
Low Pass Filter
THS3217 EVM
+
±
I Input
Q Input
Spectrum
Analyzer
Ext Trig
RF
INPUT
50
High-Pass Filter
20dB
Attenuator
Figure 71. Harmonic-Distortion Measurement: OPS Inverting and Noninverting and Midscale Buffer
Circuit Configurations
24
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