Kratos Microwave Israel

Full Line Product Catalog

Series 71 12 Bit Digital and Series 72 Analog IQ Vector Modulators

Application Notes for: Microwave Phase Shifters, IQ Vector Modulators & Frequency Translators

Both Series comprise a family of four solid-state PIN diode I-Q Vector Modulators covering the frequency range from 0.5 to 18 GHz in four bands: 0.5 to 2 GHz, 2 to 6 GHz, 4 to 12 GHz and 6 to 18 GHz. See Fig. 1. All models provide a full 360° range of phase shift and a minimum of 20 dB attenuation range at any frequency.

Series 71 and 72 IQ vector modulator block diagram
  • Simultaneous control of amplitude and phase
  • 0.5 to 18 GHz in four bands: 0.5 to 2 GHz; 2 to 6 GHz; 4 to 12 GHz; 6 to 18GHz
  • 12 Bit digitally programmable (Series 71)
  • Analog control (Series 72)
  • High speed
  • Guaranteed monotonicity
Series 71, 12 Bit Digital and Series 72 Analog I-Q Vector Modulators, rf iq vector modulator

THEORY OF OPERATION

The block diagram of the I-Q Vector Modulator is shown in Figure 1. An RF signal incident on a 3 dB quadrature hybrid is divided into two equal outputs, with a 90° phase difference between them. The in-phase, or 0°, channel is designated the I channel and the Quadrature, or 90°, channel is designated the Q channel. Each signal passes through a biphase modulator which sets the 0° or 180° state and the attenuation level for both the I and Q paths. The outputs of the I and Q path are combined to yield the resultant vector which may fall anywhere within the bounded area shown in Figure 2. Any signal applied to the I/Q Vector Modulator can be shifted in phase and adjusted in amplitude by applying the following relationships:

  1. Let the desired attenuation level = X dB and the desired phase shift
  2. The normalized output voltage magnitude is given by:
  3. The values of the I and Q attenuator control inputs are then expressed as:
    I = V cos θ
    and
    Q = V sin θ

Figure 3 shows the nominal value of I and Q vs. either digital word (Series 71) or analog voltage (Series 72). Thus, to achieve an attenuation level of 3 dB with a phase offset of 112.5° (with respect to 0 dB and 0° reference states) the values of I and Q can be calculated as follows:

V = 10–(3/20) = 0.707
I = 0.707 cos (112.5°) =–0.027
Q = 0.707 sin (112.5°) = +0.65

From Figure 3, the control inputs to yield the desired amplitude and phase are approximately:

Analog Units (72 Series) Digital Units (71 Series)
I = 5.78 volts 100101000000
Q = 2.84 volts 010010001011

While these values for I and Q will yield an output signal whose amplitude and phase are close to the nominal values over the entire operating frequency range of the vector modulator, the use of an iterative measurement procedure will determine the I and Q inputs which exactly define the desired parameter at any selected frequency.

IQ phase relationship for series 71 and 72 IQ Control characteristics 71 and 72 series vector modulators

 

PERFORMANCE CHARACTERISTICS
MODEL 7120/7220 7122/7222 7124/7224 7128/7228
FREQUENCY 0.5-2.0 GHz 2.0-6.0 GHz 4.0-12.0 GHz 6.0-18.0 GHz
INSERTION LOSS 13 dB 11 dB 12 dB 12 dB
VSWR (MAX) 1.6:1 1.8:1 1.8:1 2.0:1
POWER HANDLING Without PERFORMANCE DEGRADATION +7 dBm +20 dBm +20 dBm +20 dBm
SURVIVAL POWER (MAX) 1W
ABSOLUTE INSERTION PHASE ACCURACY VS. FREQUENCY (MAX) ±15o
VARIATION OF PHASE VS. TEMPERATURE (MAX) ±0.1 deg./ oC
ATTENUATION RANGE (MIN) 20 dB
VARIATION OF AMPLITUDE VS. TEMPERATURE (MAX) 0.02 dB/ oC
RESPONSE TIME (MAX) 0.5 µsec
POWER SUPPLY -12 to -15V @ 70 mA
+12 to +15V @ 70 mA
CONTROL INPUT  
71 SERIES 12 bit TTL for both I and Q inputs 
72 SERIES 0 to +10V DC for both I and Q inputs  
CONTROL INPUT IMPEDANCE  
71 SERIES 40  µA max 
72 SERIES  10 kohm  

ENVIRONMENTAL RATINGS - OPTION G09
Operating Temperature
   Range
.........................

-54°C to + 100°C
Non-Operating
    Temperature Range
...

-65°C to + 125°C
Humidity ........................
MIL-STD-202F, Method 103B, Cond. B (96 hrs. at 95%)
Shock .............................
MIL-STD-202F, Method 213B, Cond. B (75G, 6 msec)
Vibration ........................
MIL-STD-202F, Method 204D,Cond.B (.06" double amplitude or 15G, whichever is less)
Altitude ..........................
MIL-STD-202F, Method 105C, Cond. B (50,000 ft.)
Temp. Cycling ...............
MIL-STD-202F, Method 107D, Cond. A, 5 cycles
ACCESSORY FURNISHED
Mating power/control connector (Series 71 only)

AVAILABLE OPTIONS
Option No. Description
7
Two type K male RF connectors
10
One type K male (J2) and one SMA female (J1) RF connector
G09 Guaranteed to meet Environmental Ratings
G12 RoHS Compliant
G18 REACH Compliant

DIMENSIONS AND WEIGHT Series 71

Series 71 IQ vector modulator dimensions and weight

 

SERIES 71
MODEL A B C D E F G H J
7120 4.95±.03
(125,7)
3.38±.03
(85,9)
1.02
(25,9)
4.75±.01
(120,7)
3.12±.01
(79,2)
2.62
(66,5)
1.69
(42,9)
2.47
(62,9)
.73
(18,5)
7122
3.25±.03
(82,6)

3.25±.03
(82,6)

.85
(21,6)

3.05±.01
(77,5)

3.00±.01
(76,2)

1.63
(41,4)
1.99
(50,5)

1.63
(41,4)

.64
(16,3)
7124 1.83
(46,5)
7128 3.00±.03
(76,2)
3.00±.03
(76,2)
.96
(24,4)
2.80±.01
(71,1)
2.75±.01
(69,9)
1.50
(38,1)
1.63
(41,4)
1.50
(38,1)
.76
(19,3)

 

J3 PIN FUNCTION
PIN FUNCTION PIN FUNCTION
1 I-5 20 I-4
2 I-6 21 I-7
3 I-8 22 I-3
4 I-9 23 I-2
5 I-10 24 I-1 (LSB)
6 I-11 25 I-12 (MSB)
7 N/C 26 N/C
8 +12 to +15V 27 N/C
9 GND 28 GND
10 GND 29 N/C
11 -12 to -15V 30 N/C
12 Q-3 31 N/C
13 Q-2 32 Q-4
14 Q-1 (LSB) 33 N/C
15 Q-5 34 N/C
16 Q-6 35 Q-12 (MSB)
17 Q-7 36 Q-11
18 Q-8 37 Q-10
19 Q-9  
MODEL WEIGHT (APPROX)
7120
7122
7124
7128
13 oz. (369 gm)
10 oz. (284 gm)
10 oz. (284 gm)
9 oz. (255 gm)

DIMENSIONS AND WEIGHT Series 72

Series 72 IQ vector modulator dimensions and weight

 

              SERIES 72
MODEL A B C D E F G H J
7220 4.95±.03
(125,7)
3.38±.03
(85,9)
1.02
(25,9)
4.75±.01
(120,6
3.12±.01
(79,2)
1.68
(42,7)
0.75
(19,1)
1.75
(44,5)
73
(18,5)
7222
3.25±.03
(82,6)

3.25±.03
(82,6)

.85
(21,6)

3.05±.01
(77,5)

3.00±.01
(76,2)

1.63
(41,4)
1.99
(50,5)

0.90
(22,9)

.64
(16,3)
7224 1.83
(46,5)
7228 3.00±.03
(76,2)
3.00±.03
(76,2)
.96
(24,4)
2.80±.01
(71,1)
2.75±.01
(69,9)
1.50
(38,1)
1.63
(41,4)
0.78
(19,8)
.76
(19,3)

 

MODEL WEIGHT (APPROX)
7220
7222
7224
7228
13 oz. (369 gm)
10 oz. (284 gm)
10 oz. (284 gm)
9 oz. (255 gm)

 

Dimensions in  mm (Inches) Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.005

 


The information contained in this data sheet is basic marketing information and does not contain any export controlled information.