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Downconverting RF and Microwave Signals into the
Range of the Agilent Acqiris Digitizers
External components with wide bandwidths can be used to downconvert signals
into the range of the broadband VSAs.
The 89600 VSA software can account for the mixing equation of the external
downconverter. While the downconverter cannot be controlled by the software,
the downconverter’s input center frequency, IF bandwidth, external bandwidth,
and IF mirroring can be taken into account by using the Utilities/Calibration /
Frequency menu picks. See the Help text for further details on using the external
frequency tool.
Appendix A
Figure 10. Block diagram of suggested downconverter. See Table 4 for further details.
RF in
LO in
IF out
200 to 500 MHz
Bandpass filter: Mini-Circuits BLP-600
IF amp: Mini-Circuits ZFL-500
Table 7. External wideband downconverter details
RF range Mixer LO IF amp Remarks
0 to 2 GHz
(see Table 1)
None None Use digitizer Ch1 or Ch2
(VSA Ch2)
0.2 to 6 GHz Marki
1
M2-0006MA
16 to 19 dBm
F
LO
= F
RF
- F
IF
Mini Circuits
2
ZFL-500
F
IF
– 200 -500 MHz
Mxr: CL = 8 dB, TOI = 18 dBm,
Amp: gain = 20 dB, NF = 5.5 dB,
TOI = +18 dBm
5 to 40 GHz Marki
1
M9-0540IN
3 to 17 dBm
F
LO
= F
RF
- F
IF
As above Mxr: CL = 8 dB, TOI = 16 dBm
25.6 to 40 GHz Agilent
11970A
15 dBm
F
LO
= (F
RF
- F
IF
)/8
As above 8
th
harmonic waveguide mixer,
Mxr: CL = 22 dB, TOI = 15 dBm
33 to 50 GHz Agilent
11970Q
15 dBm
F
LO
= (F
RF
- F
IF
)/10
F
IF
= 0 – 1 GHz
As above 10
th
harmonic waveguide mixer,
Mxr: CL = 24 dB, TOI = 15 dBm
1. Marki Microwave, http://www.markimicrowave.com Telephone: 408-778-4200, FAX: 408-778-4300, 215 Vineyard Court, Morgan Hill, CA 95037
2. Mini-Circuits, Inc., 1-800-654-7949, 44-1252-83600, http://www.minicircuits.com.