Agilent Technologies N8201A User Manual download pdf (Page 7)

Gain compression

1 dB gain compression point (two-tone)

RF input frequency Maximum power at mixer

Nominal power at mixer

Preamp off

20 to 200 MHz 0 dBm +3 dBm

200 MHz to 3.0 GHz +3 dBm +7 dBm

3.0 to 6.6 GHz +3 dBm +4 dBm

6.6 to 26.5 GHz –2 dBm 0 dBm

Preselector bypassed (Option 123)

3.045 to 26.5 GHz +8 dBm

Preamp on (Option 1DS) Nominal power at preamp

10 to 200 MHz –30 dBm

200 MHz to 3 GHz –25 dBm

Preamp on (Option 110)

10 to 200 MHz –24 dBm

200 MHz to 3 GHz –20 dBm

3.0 to 6.6 GHz –23 dBm

6.6 to 26.5 GHz –27 dBm

Gain compression (two-tone) (typical)

RF input frequency Mixer level

Compression

20 to 200 MHz 0 dBm < 0.5 dB

200 MHz to 6.6 GHz +3 dBm < 0.5 dB

6.6 to 26.5 GHz –2 dBm < 0.4 dB

Noise figure

(Input terminated, 0 dB input attenuation)

Frequency Noise figure Noise figure Input referred noise density

(typical) (typical)

Preamp off

(Option 110 not installed)

10 to 100 kHz 38 dB 34 dB –139 (dBm/Hz)

100 kHz to 1 MHz 30 dB 26 dB –147 (dBm/Hz)

1 to 10 MHz 25 dB 22 dB –151 (dBm/Hz)

10 MHz to 1.2 GHz 22 dB 20 dB –153 (dBm/Hz)

1.2 to 2.1 GHz 23 dB 21 dB –152 (dBm/Hz)

2.1 to 6.6 GHz 24 dB 22 dB –151 (dBm/Hz)

6.6 to 13.2 GHz 26 dB 21 dB –152 (dBm/Hz)

13.2 to 20 GHz 29 dB 26 dB –147 (dBm/Hz)

20 to 26.5 GHz 33 dB 30 dB –143 (dBm/Hz)

1. Gain compression is described by a level/compression pair where for every mixer level there is a different amount of compression. The first table labeled

“1 dB compression point” indicates the signal level where you will see 1 dB of compression, where as the second table indicates the amount of compression

to expect at a given signal level.

2. Large signals, even at frequencies not within the IF bandwidth, can cause in-band signals to be compressed because of two-tone gain compression.

This specification tells how large an interfering signal must be in order to cause a 1 dB change in an in-band signal.

3. Mixer power level (dBm) = input power (dBm) – input attenuation (dB).

4. Input referred noise density (dBm/Hz) = thermal noise at +55 °C (dBm) + noise figure of the downconverter (dB). The noise measured at the IF output’s of

the downconverter will be higher due to the Conversion gain, the measurable noise density is not diminished due to this gain.

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Agilent Technologies N8201A User Manual Page 7

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