2 TO 18 GHz SINGLE-SIDEBAND UPCONVERTER OR I/Q MODULATOR
MODEL: SM0218LC1CD__ (Carrier Driven)
*
MODULATOR PRODUCTS
FEATURES
• RF output/carrier input .......... 2 to 18 GHz
• Linear modulation input ........ Up to +5 dBm
• Carrier input power ................ +10 to +16 dBm
• Sideband suppression ........... 20 dB
• Carrier rejection...................... 25 dB
• IF options:
Single sideband ...................... A, B and C
(internal hybrid)
I/Q modulator .......................... Q (separate inputs)
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. This model employs carrier drive. All modulators yield a frequen-
cy spectrum that utilizes both sidebands on either side of the output suppressed carrier. SSB upconverters, howev-
er, employ an internal IF 90° hybrid to yield only one 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. Greater output power
can be achieved by using higher level diodes with proportional increases in carrier power. This carrier driven unit is
used when the modulation input to RF output must be linear (low harmonics). A typical application is for digital QPSK
with cosine shaped pulses (for minimum bandwidth). Many SSB upconverters also require input-to-output signal lin-
earity, thus requiring LO drive.
ELECTRICAL SPECIFICATIONS
INPUT PARAMETERS
RF carrier
RF VSWR (RF = +13 dBm, IF modulation = 0 dBm)
RF power (low-level diodes)
IF modulation frequency range (Note 3)
IF modulation power range (total I/Q)
TRANSFER CHARACTERISTICS
Conversion loss (Note 1)
Carrier suppression (RF = +13 dBm, IF modulation = +5 dBm)
Sideband suppression (Note 2)
Carrier – fundamental IF
Carrier ±2 IF, 4 IF, etc.
Carrier ±3 IF
Quadrature phase accuracy, I/Q mode (see Graph Key)
Quadrature amplitude accuracy
OUTPUT PARAMETERS
RF frequency range
RF VSWR (RF = +13 dBm, IF modulation = 0 dBm)
dBc
dBc
dBc
Degrees
dB
UNITS
GHz
Ratio
MIN.
2
2.5:1
15
18
45
40
±10
±1
TYP.
MAX.
18
UNITS
GHz
Ratio
dBm
MHz
dBm
UNITS
dB
dBc
+10
DC
Noise
MIN.
TYP.
8
12
MIN.
2
2:1
+13
+16
500
+7
MAX.
12
TYP.
MAX.
18
100 Davids Drive, Hauppauge, NY 11788 • TEL: (631) 439-9220 • FAX: (631) 436-7430 •
www.miteq.com
SM0218LC1CDQ CARRIER DRIVEN TYPICAL TEST DATA
RF Phase (Deg.)
I/Q
Graph Key
0
+90
+/+
-/+
-90
+/-
+180
-/-
I/Q MODE (RF = +13 dBm, I/Q = 0 dBm each input (0.316 volts peak across 50 ohm load)
STATIC AMPLITUDE BALANCE
STATIC PHASE BALANCE
AMPLITUDE BALANCE (dB)
+4
+2
REF
-2
-4
2
10
18
+40
PHASE BALANCE (DEG.)
+20
REF
-20
-40
2
10
18
FREQUENCY (GHz)
FREQUENCY (GHz)
SM0218LC1CDC CARRIER DRIVEN OUTPUT SPECTRUM TABLE
SSB UPCONVERTER (RF = +13 dBm, IF = +3 dBm total, IF = 100 MHz)
Frequency
(GHz)
2
4
6
8
10
12
14
16
18
fo + IF
(I.L., dB)
Note 1
9
11
9
8
8
7
8
10
10
fo - IF
(dBc)
28
31
32
35
21
25
24
22
21
fo
(dBc)
9
17
18
37
30
22
16
12
20
fo - 2 IF
(dBc)
35
52
46
48
49
46
47
40
38
fo + 2 IF
(dBc)
36
53
51
48
47
45
42
40
39
fo - 3 IF
(dBc)
32
41
53
48
48
43
38
34
33
fo + 3 IF
(dBc)
50
41
43
44
41
42
38
37
37
MAXIMUM RATINGS
Specification temperature.................... +25°C
Operating temperature ........................ -54 to +85°C
Storage temperature .......................... -65 to +125°C
GENERAL NOTES
1. Insertion loss relative to +3 dBm IF input. All other outputs,
including fo, are relative to the desired upper (fo + fm) output.
2. Standard SSB units with IF hybrids are aligned for upper
sideband operation. For lower sideband or selectable sideband,
contact MITEQ.
*3. Available part numbers: SM0218LC1CD__
*
A = 20–40 MHz
B = 40–80 MHz
C = 100–200 MHz
Q = DC–500 MHz
NOTE:
Test data supplied at 25°C; insertion loss, phase and amplitude balance per spectrum table.
OUTLINE DRAWING
SM0218LC1CDA, B and C
TERMINATION
(50 OHMS)
2.50 [63.50]
.50 [12.70]
1.0 [25.40]
RF
IN
TERM
IF 1
LSB
BLOCK DIAGRAMS
SM0218LC1CDA, B and C
IF
RF CONNECTORS
SMA FEMALE
(TYP. 4 PLACES)
.25 [6.35]
RF
IN
90°
R
L
0°
90°
IF
LSB
1.00 [25.40]
2.0
[50.80]
1.75 [44.45]
R
L
IF
IF
USB
RF
OUT
RF OUT
SSB
UPCONVERTER
IF 2
USB
SM0218LC1CDQ
.25 [6.35]
TERMINATE UNUSED
IF OUTPUT
FINISH: NICKEL
.50 [12.70]
R
L
IF
IF
.075 [1.905]
2.35 [59.69]
MOUNTING HOLES
.100 [2.54] DIA. THRU
(TYP. 4 PLACES)
RF
IN
90°
R
L
0°
I
RF OUT
.25 [6.35]
NOTE: All dimensions shown in brackets [ ] are in millimeters.
I/Q
MODULATOR
Q
100 Davids Drive, Hauppauge, NY 11788 • TEL: (631) 439-9220 • FAX: (631) 436-7430 •
www.miteq.com
4B/347
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