AD8260

Rev. 0 | Page 18 of 32

VMDO

0.1µF

100Ω

+

–

100Ω

PREAMP

IN

NETWORK ANALYZER

0.1µF 453Ω

0.1µF 453Ω

50Ω

50Ω

AD8260—VGA/PREAMPLIFIER

Figure 59. Test Circuit for Frequency Response and Group Delay of the VGA/Preamplifier

+3.3V

–3.3V

0.1µF

100Ω

+

–

100Ω

PREAMP

IN

NETWORK ANALYZER

WITH S-PARAMETER

CAPABILITY

50Ω

AD8260—VGA/

PREAMPLIFIER

Figure 60. Test Circuit for Output Resistance of the VGA/Preamplifier

0.1µF

1kΩ

1kΩ

100Ω

100Ω

VMDO

VMDO

SPECTRUM

ANALYZER

50Ω

+

–

PREAMP

VGA

0.1µF

0.1µF

0.1µF

AD8129

×10

AD8260—VGA/PREAMPLIFIER

Figure 61. Test Circuit for Input-Referred and Output-Referred Noise Measurements of the VGA/Preamplifier