Agilent Technologies HP 8642A/B Specifiche Scaricare il pdf (Pagina 337)

100

101

Considerations When Using a Down Converter

Absolute System Noise Floor

The HP 11729C measurement system noise floor is dependent on the RF

reference source(s) used. System noise for the phase detector method is a

composite of the noise on the multiplied 640 MHz reference, the residual

noise of the down converter, and the noise of the RF tunable source at

the phase detector input (front panel noise of the HP 8662A/8663A). For

the frequency discriminator method, system noise is a composite of the

noise on the multiplied 640 MHz signal plus the noise of the HP 11729C

and the discriminator circuit noise. System noise can be described by:

^system = 10

log{N

X 10^ + 10& + 1QT*)

This equation is valid to 100 kHz. At 1 MHz and

above,

the first term does not contribute

due to the

SAW

filter in the HP 11729C.

where N = center frequency of selected filter/640 MHz

Ci = absolute SSB phase noise of 640 MHz ref. signal (dBc/Hz)

£2

—

absolute SSB phase noise of 5 to 1280 MHz ref. signal (dBc/Hz)

£3 = residual noise of the HP 11729C {dBc/Hz)

Specified Noise

The HP 11729C, when used with the HP 8662A/63A Option 003,

provides a specified 640 MHz reference with EFC. Although the HP

11729C can be used in the self oscillation mode the phase noise

performance is not guaranteed.

Down Converters 6-35

1 2 ... 332 333 334 335 336 337 338 339 340 341 342 ... 452 453

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Agilent Technologies HP 8642A/B Specifiche Pagina 337

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