228 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Micro-Deck Assembly
A7 Micro-Deck Assembly Overview
Frequency Range
There are four frequency range options available in the microwave instruments,
as shown in Table .
To cover the different frequency range options there are two variations of the
A7 Micro-Deck assembly. One is for the option 513 and 520 instruments, and
the other is for the option 532 and 540 instruments. The main difference
between these two assemblies is that the one for the option 532 and 540
instruments has the addition of the A7A4 40 GHz Doubler assembly.
Signal Path
There are two main signal paths on the A7 Micro-Deck. They are:
9 kHz to <3.2 GHz
Below 3.2 GHz the signal comes from J2002 of the A3 RF assembly to J3 of the
A7A3 Mod-Filter assembly. From there it is switched into the RF output path of
the source as needed. However, there are no amplifiers or modulators in the
path for these frequencies on the A7 Micro-Deck assembly, all amplitude level
adjustments are made on the A3 RF assembly. The only exception to this would
be if option 1E1 is installed, which would enable the A7AT1 Attenuator, which
would work in conjunction with the ALC circuitry to achieve the amplitude
range desired.
3.2 GHz and Above
For frequencies of 3.2 GHz and above, the signal comes from J2004 of the A3
RF assembly to J1 of the A7A2 20 GHz Frequency Multiplier assembly. The
frequency range of this signal is 2.5 GHz to 5 GHz. Depending on the desired
output frequency, the A7A2 20 GHz Frequency Multiplier will either pass it
through as is, multiply it by two, or multiply it by four, as seen in Table .
Frequency Range Option Frequency Range
513 9 kHz to 13 GHz
520 9 kHz to 20 GHz
532 9 kHz to 31.8 GHz
540 9 kHz to 40 GHz
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