IF Frequency Response Performance Test

This test applies to the following models:

IF Frequency Response is one component of the analyzer Error Vector Magnitude (EVM) spec.

In this test a 1.825 GHz, –10 dBm signal is applied to the analyzer. This input level establishes a mixer level of –20 dBm. A reference amplitude is taken with the input signal centered at the analyzer center frequency. The analyzer center frequency is then changed to set the input signal at various offsets within the FFT span of interest.

At each offset frequency the amplitude is measured by the analyzer. The amplitude difference between the offset frequency and the reference frequency is reported as the IF Frequency Response. This measurement is performed in IQ analyzer mode, so the span is also the FFT width.

This measurement is performed for the standard 10 MHz IF path. For Option B25 , the bandwidth is 25 MHz. The measurement is repeated for Option B40 (40 MHz IF path), and the widest available option for Option B85 (85 MHz IF path), Option B1A (125 MHz IF path), or Option B1X (140 MHz IF path) if installed in the signal analyzer. The 25 MHz, 40 MHz, 85 MHz/125 MHz/140 MHz paths are different IF paths, so each is tested separately.

The IF Frequency Response is also tested in bands 1 through 6 for Option MPB (Microwave Preselector Bypass). Bands 1 through 6 can only be tested if Option MPB is installed because the YTF will band limit the input signal.

 

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Required Test Equipment

Test Equipment

Recommended Model Number

Microwave Signal Generator #1

PSG Models
(see equipment list)

BNC Cable

8120-1840

Coaxial Cable, 3.5 mm

11500E

Coaxial Cable, 2.4 mm

8120-6164

3.5 mm (f) to 3.5 mm (f) adapter
(for 3.5 mm source)

83059B

Type-N (m) to 3.5 mm (f) adapter

1250-1744

2.4 mm (f) to 3.5 mm (f) adapter
(for 2.4 mm source)

11901B

2.4 mm (f) to 2.4 mm (f) adapter
(for Options 543, 544, or 550)

11900B

Connection Setups

IF Frequency Response Test Setup