Agilent Technologies 8510XF Operating And Service Manual page 149

0.045 to 2 GHz Band
2 to 50 GHz Band
50 to 75 GHz Band or
50 to 85 GHz Band
75 to 110 GHz Band
The frequency bands are described individually below.
In the .045 to 2 GHz range, the signal from the RF source is not multiplied; it
is applied directly to the mixers. The mixers for this range are located in the
millimeter-wave controller.
The mixers use the fundamental of the LO input frequency, rather than a
harmonic of it. During operation in this band, the RF source and LO source
generate a pair of frequencies 20 MHz apart, in order to create a 20 MHz IF
output from the mixer.
In the 2 to 50 GHz range, the signal from the RF source is not multiplied; it
is applied directly to the mixers. The mixers for this range are located in the
test heads (in the upper half of the test head, which is designated the
microwave subassembly).
In the 2 to 18 GHz portion of this band, the mixers use the fundamental of
the LO input frequency; the RF and LO frequencies are 20 MHz apart.
In the 18 to 50 GHz portion of this band, the mixers use the third harmonic
of the LO input frequency, rather than the fundamental. The LO frequency is
roughly one-third of the RF frequency (with a slight frequency offset, to
create the 20 MHz IF).
In the 50 to 75 GHz range, the signal from the RF source is applied to a
frequency doubler in the test head. The mixers for this range are located in
the test heads (in the lower half of the test head, which is designated the
millimeter-wave subassembly). The range of this band becomes 50 to
85 GHz, in systems for which 85 GHz is the upper frequency limit.
The mixers use different harmonics of the LO input frequency in different
portions of the band, as shown in
Because of the doubler in the test head, the frequency at the test port is twice
the frequency of the RF source.
In the 75 to 110 GHz range, the signal from the RF source is applied to a
frequency tripler in the test head. The mixers for this range are located in the
test head (in the lower half of the head, which is designated the
millimeter-wave subassembly).
The mixers use different harmonics of the LO input frequency in different
portions of the band, as shown in
Because of the tripler in the test head, the frequency at the test port is three
times the frequency of the RF source.
Table 5-2 and Table 5-3.
Table 5-2.
8510XF Network Analyzer Systems 5-13
System Maintenance
Theory of Operation