SECTION THREE
SSB UPCONVERTERS AND VECTOR MODULATORS/PHASE SHIFTERS
fm
fo
fm
ROM
D/A
fo
MPSK
ROM
D/A
SDM, SML-A...D
Single-Sideband Upconverter
LO and 1/2 LO
CARRIER DRIVEN
(LINEAR IF QAM)
(NOTE 1)
CARRIER SIDEBAND
REJECTION REJECTION
(dBc)
(dBc)
25
30
30
30
20
20
25
35
12
12
20
15
15
20
20
30
20
20
30
24
23
18
18
28
15
15
SMC, SME...AVC/DIQ
Analog/Digital, Phase/Amp Control
IF DRIVEN
(LINEAR RF PM)
(NOTE 2)
CARRIER SIDEBAND
REJECTION REJECTION
(dBc)
(Typ./Min.)
35
34
35
35
25
25
30
30
25
25
25
20
20
25 / 15
25 / 15
35 / 27
20 / 18
20 / 18
35 / 25
24 / 20
23 / 20
18 / 15
20 / 18
28 / 25
23 / 20
18 /15
MODEL
NUMBER
SDM0102LC1CD
SDM0104LC1CD
SME0104LI1MD
SDM0204LC1MD
SDM0208LC1MD
SME0208LI1MD
SM0408LC2MD
SM0812LC2MD
SM0218LC1CD/MD
SM0618LC2MD
SME0618LI1CD/MD
SM1218LC2MD
SM0226LC1MD
FREQUENCY RANGE
RF
IF
IN AND OUT
(GHz)
(GHz)
(Note 3)
1
1
1
2
2
2
4
8
2
6
6
12
2
–
–
–
–
–
–
–
–
–
–
–
–
–
2
4
4
4
8
8
8
12
18
18
18
18
26
DC
DC
DC
DC
DC
DC
DC
DC
DC
DC
DC
DC
DC
–
–
–
–
–
–
–
–
–
–
–
–
–
SSB UPCONVERTERS WITH INTERNAL IF HYBRIDS
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
1
0.5
8 / 10
8 / 10
10 / 12
8 / 10
9 / 11
8 / 11
6/9
6/9
8 / 12
8 / 10
9 / 13
7 / 10
12 / 15
CONVERSION
LOSS
(Typ./Max.)
PAGE
59
61
63
65
67
69
71
73
75
79
81
85
87
NOTES
8
8
Schottky diodes, 8
ANALOG OR DIGITALLY CONTROLLED VECTOR MODULATORS/FREQUENCY TRANSLATORS
SM0206MAVC
SM0618MAVC
SMC0618LAVC
SME0618DIQ
2–6
6 – 18
6 – 18
6 – 18
DC – 30 MHz
DC – 30 MHz
DC – 500 MHz
TTL
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
25
35
35
30
23 / 20
27 / 28
32 / 33
30 / 25
8.5 / 11.5
7 / 11.5
16 / -
10 / 13
89
91
93
95
PIN diodes
PIN diodes
Schottky diodes
Digital phase/vector
GENERAL
All modulators and SSB upconverters require that at least one of the input frequency bands (carrier or modulation) has sufficient power to turn on the
semiconductors used in the various designs (i.e., Schottky diodes or PIN diodes). All modulators yield a frequency spectrum that utilizes both sidebands
on either side of the output suppressed carrier. SSB upconverters employ an internal IF 90 degree hybrid to yield only 1 RF sideband output. This is
offset above or below the input LO by the IF frequency (test data is recorded for the upper sideband only). Schottky diode (standard) modulators have
the greatest speed and bandwidths, but yield RF output powers of typically less than 0 dBm. PIN diode (optional) designs can only be driven at
modulation rates of less than 30 MHz, but will yield output RF powers exceeding +5 dBm. PIN or Schottky modulators that vary only the RF carrier
phase, in many discrete steps or continuously, are referred to as phase shifters or frequency translators respectively. When output RF amplitude and
phase control is required, the device is usually called a vector modulator. For the latter device, phase accuracy is usually specified over a given
amplitude range (in dB). All MITEQ modulators can be driven in the carrier or modulation modes as explained below, but test data is only recorded in
the modulation driven mode.
SECTION 3 NOTES
Note 1:
Carrier driven: LO = +13 dBm, I/Q = 0 dBm. Used when any amplitude variation or pulse shape of the modulation must be accurately
transferred to the RF output envelope. A communication example would be directly modulating a microwave carrier with Gaussian shaped
I/Q digital pulses to minimize the channel bandwidth required.
Note 2:
Modulation driven: RF = 0 dBm, I/Q = +10 dBm or ±10 mA or TTL. Used when RF input has wide dynamic range, such as for military and
commercial Doppler frequency shift generation or corrections. If desired, the harmonic distortion of the relatively fixed and higher level I/Q
drive third order harmonics can be linearized by “resistance/diode” or digital “ROM” wave shaping techniques. The latter is often used in
vector modulator applications, such as in the model SME0618LI1DIQ design.
Note 3:
To specify the IF frequency for SSB upconverter usage, select from the following standard options and add to end of model number or
contact MITEQ:
Suffix A: 20–40 MHz, Suffix B: 40–80 MHz, Suffix C: 100–200 MHz, Suffix D: 500–1000 MHz, Suffix Q: I/Q inputs
Note 4:
Conversion loss (CL) is relative to lowest power input (f
o
, f
m
). All other outputs (including f
o
, are relative to the desired upper (f
o
+ f
m
) output.
Note 5:
Standard units with IF hybrids are aligned for upper sideband operation. For lower sideband or selectable sideband, contact MITEQ.
Note 6:
Last two characters in model number indicate standard outline number, see outline section.
Note 7:
Question and answer modulator application notes available, contact factory.
Note 8:
Hermetically sealed housing.
4
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