Agilent Technologies 85032B/E 50 Specifiche Pagina 224

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8712ET/ES and 8714ET/ES Theory of Operation
RF Network Analyzers System Theory
Service Guide 6-9
8712ET/ES Source Assembly (A4)
The source assembly provides two output signals. One signal is the main source RF output
signal which has a range of 0.3 to 1300 MHz. The other signal serves as the internal
receiver local oscillator (LO) for downconverting narrowband signals. The two signals are
independently phase-locked, and they are separated from one another by the receiver
intermediate frequency (IF) of 27.778 kHz.
The RF and the receiver LO output signals are generated from 3 phase-locked VCOs,
called RF1, SOURCE LO and RF2 (refer to Figure 6-3). In normal operation the following
occurs:
The RF1 VCO is phase-locked to a 10 MHz reference signal, from the fractional-N
board, to produce a stationary 2340 MHz signal.
The RF2 VCO is also phase locked to the same 10 MHz reference to produce a
stationary signal that is offset from RF1 by the receiver IF of 27.778 kHz.
The SOURCE LO VCO is phase locked to the 30 to 60 MHz output from the fractional-N
board.The output of the SOURCE LO VCO is a swept frequency of
2340.3 to 3640.0 MHz that mixes with the VCO outputs of the RF1 and RF2.
Figure 6-3 Simplified Block Diagram of the 8712ET/ES A4 Source
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