Microwave Electronics Products

Series 77 10 Bit Digital Phase Shifters and Series 78 Analog Phase Shifters Frequency Translators

Application Notes for Microwave Phase Shifter

DIGITAL PHASE SHIFTER & ANALOG PHASE SHIFTER

Both Series, 77 and 78, comprise a family of eight solid-state PIN diode phase shifters 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. All models provide a full 360° range of phase shift and may also be used for frequency translation applications.
 
Each unit is an integrated assembly of an RF vector modulator and a driver circuit, consisting of a 10-bit D/A converter and a voltage buffer in the Series 77 digital units (see Fig. 1A) and a voltage converter and buffer in the Series 78 analog configuration (see Fig. 1 B).
 
The phase in the Series 77 is digitally controlled over a full 360° in 0.35° discrete steps. The voltage converter in the Series 78 consists of a 8 bit A/D converter followed by D/A converter, and converts a continuous analog input voltage into discrete steps of 1.41°.

 
 

   5 to 18 GHz in four bands     10 Bit 360 digital phase shifters and frequency translators, Series 77 and 78 pin diode - Kratos General Microwave
      1) 0.5 to 2 GHz  
      2) 2 to 6 GHz  
      3) 4 to 12 GHz  
      4) 6 to 18 GHz  
  10 Bit digitally programmable (Series 77)  
   Analog control (Series 78)  
   High speed  
   Guaranteed monotonicity  

 

 Series 78 phase shifter/frequency translator block diagramSeries 77 phase shifter/frequency translator block diagram

 

 Phase Shift
Phase shift is achieved utilizing the RF vector modulator approach shown in Fig. 2. The 3 dB hybrid coupler divides the RF signal into two quadrature components which are then modulated in proportion to the sine and cosine of the desired phase shift. The signals are then combined in-phase to yield the phase-shifted output.
  

RF vector modulator diagram, Series 77 and 78

 Freqyency Translator (Serrodyning)
 
Special attention in the design of the units has been paid to those characteristics which affect their performance as frequency translators. These include minimizing PM-to-AM conversion, use of high slew rate drivers, and optimizing phase shift linearity with applied signal. As a result, carrier and sideband suppression levels of over 25 and 20 dB, respectively, are obtained in the main bands. The same carrier and sideband performance can be realized over the full stretch band when the internal frequency correction circuit is employed.
 
See Fig. 3 for input voltage control requirements for Series 77 and 78 when used as a frequency translator.
 
On special order, frequency translators can be provided for operation over reduced bandwidths with suppression levels of up to 35 dB. Consult the factory for special requirements

Series 77 and 78 input requirements chart

 

 

PERFORMANCE CHARACTERISTICS
 
SERIES 77
Control ........................................... 10 bit TTL
Nominal Resolution ......................... 0.35o
Logic Input
   Logic "0" (Bit OFF)............... -0.3 to +0.8V @ 500 µA max
   Logic "1" (Bit ON)............ +2.0 to +5.0V @ 100 µA max
   
SERIES 78 
Control Voltage .......................  0 to +6V
Sensitivity   .......................,,,,,,, 23.4 mV/LSB
Resolution ................................ 1.41°
Step Uncertainty ...................... 0.7° max, 0.3°typ.
Input Resistance ........................  2K ohms
 
COMMON TO BOTH SERIES 77 & 78
Power Handling Capability Without Performance Degradation.....
+20 dBm (+7 dBm for 7720A, 7820)
Survival ............................... +30 dBm
Harmonics ........................... -30 dBc
Phase Variation .................. 0.1°/°C
 

  

POWER SUPPLY REQUIREMENTS

 VOLTAGE  SERIES 77 SERIES 78 
 +5V to +5.5V  100 mA  200 mA
 +12 to +15V  100 mA 100 mA
 -12 to -15V  90 mA 90 mA

 PHASE SHIFTER SPECIFICATIONS
MODEL NOS. FREQUENCY RANGE (GHz) INSERTION LOSS (Max.) VSWR (Max.) ACCURACY(1) (Max.) PM/AM (Max.)
7720A & 7820 Main Band 0.7-1.9(1) 11.5 dB  1.75 ±10° ±1.1dB
Stretch Band 0.5-2.0(2) 13.0 dB ±15° ±2.5dB
Band Edges 0.5-0.7 & 1.9-2.0(3) 13.0 dB ±10° ±1.1dB
7722A & 7822 Main Band 2.6-5.2(1) 10.0 dB 1.6 ±10° ±1.1dB
Stretch Band 2.0-6.0(2) 11.0 dB ±15° ±1.5dB
Band Edges 2.0-2.6 & 5.2-6.0(3) 11.0 dB ±10° ±1.1dB
7724A & 7824 Main Band 4.5-10.5(1) 10.5 dB 1.8 ±10° ±1.1dB
Stretch Band 4.0-12.0(2) 12.0 dB ±15° ±2.0dB
Band Edges 4.0-4.5 & 10.5-12.0(3) 12.0 dB ±10° ±1.1dB
7728A & 7828 Main Band 8.0-18.0(1) 12.0 dB 2.0 ±12° ±1.25dB
Stretch Band 6.0-18.0(2) ±15° ±2.0dB
Band Edges 6.0-8.0(3) ±12° ±1.25dB
OTHER SPECIFICATIONS Switching Speed (50% TTL to within 10° of Final Phase Value): 500 nsec Max. Minimum phase shift range: Series 77: 360° in 1024 Steps (10 -bit) Series 78:360° @ 60°/volt

FREQUENCY TRANSLATOR SPECIFICATIONS

 

TRANSLATION RATE (min.) CARRIER (1) SUPRESSION (min.) SIDE BAND (1) SUPRESSION (Min) INTERATION LOSS VARIATION (Max.) with translation rate:
0 to 50 kHz(4) Main Band: 25dB
Stretch Band: 18dB
Main Band: 20dB
Stretch Band: 15 dB
50kHz: 1dB
>50 to 500 kHz(4) Main Band: 20dB
Stretch Band: 15dB
Main Band: 18 dB
Stretch Band: 12 dB
200kHz: 1dB
500kHz: 3dB

 

NOTES:  BAND SELECTION BY PIN 3 OF J3 LOGIC LEVEL ASSIGNMENT

 

(1) For Main Band optimized operation, apply logic HIGH to pin 3 or leave it floating.


(2) For Stretch Band operation, apply logic HIGH to pin 3 or leave it floating. While performance is optimized over the Main

     Band, the reduced performance as stated in Stretch Band specifications apply to band edges.

 (3) For Band Edges optimized operation, apply logic LOW to pin 3.


(4) All specifications are met using five or more most significant bits for 0 to 50 kHz translation rates.
      For 50-500 kHz translation rates, only the four most significant bits are used.
   

TYPICAL PERFORMANCE 

Typical performance charts for Series 77 and 78 phase shifters/frequency translators 

NARROW BAND PHASE SHIFTERS

In addition to the standard wide band Phase Shifters, KRATOS General Microwave is offering Narrow Band Phase Shifters. These units are available both as standard catalog units and as customized units meeting specific customer’s requirements. The narrow band units have better performances and lower prices.

Frequency Range Model Number Phase Accuracy PM/AM Insertion Loss
8.0 to 12.4 GHz 7728-NB-0812 ± 8o (max.) ± 0.75 dB 12.0 dB (max.)
12.0 to 14.5 GHz 7728-NB-1214 ± 8o (max.) ± 0.75 dB 12.0 dB (max.)
 
ENVIRONMENTAL RATINGS - OPTION G09
Operating Temperature Range...............
-54° to + 100°C
Non-Operating Temperature Range...... -65° to + 125° C
Humidity ........................... MIL-STD-202F, Method 103B, Cond. B (96 hrs at 95%)
Shock ...................................  MIL-STD-202F, Method 213B, Cond. B (75 G, 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
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


ACCESSORIES FURNISHED

 
Mating power/control connector  
   
   
 AVAILABLE OPTIONS
   
 Option no.  Description
 7  Two SMA male rf connectors
 10  One SMA male (J2) and one SMA female (J1) rf connector   
 G09  Guaranteed to meet Environmental Ratings
 G12  RoHS Compliant
   
   
   

 

 

J3 PIN FUNCTIONS
PIN
No.
FUNCTION
SERIES
77 (1)
SERIES
78
1 -12 V to -15 V -12 V to -15 V
2 +12 V to +15 V +12 V to +15 V
3 Freq.Correction Circuit Select(3) "0" = Band Edge Freq.Correction Circuit Select "0" = BandEdge
4 1.4°(3) Not Used
5 5.6°(3) Not Used
6 45.0°(3) Not Used
7 180.0° (MSB)(3) Not Used
8 90.0°(3) Not Used
9 Ground Ground (Sig)
10 0.7°(3) Ground (Pwr)
11 22.5° Not Used
12 2.8° Not Used
13 11.3° Not Used
14 0.35° (LSB) Control Voltage
15 +5V to +5.5V DC +5V to +5.5V DC
  1. Unused logic bit must be grounded.
  2. Must not exceed +7VDC See footnote(3) below.
  3. Must not be greater than +0.3VDC above voltage at pin 15.
MODEL A B C D E F G H J K WEIGHT(APPROX)
7720A 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)  2.48(62,9)  .73(18,5) 32(8,1)  13 oz.
(369 gm)
7820 1.48 (37,6) 1.18 (30,0) .78(19,8) 15 oz.
(425 gm)
7722A 3.25 ± .03(82,6) 3.25 ± .03(82,6) .84(21.3) 3.05 ± .01(77,5) 3.00 ± .01(76,2) 1.63(41,4) 1.99(50,5) 1.63(41,4) .66(16,8) .32(8,1) 9 oz.
(255 gm)
7822 1.25(31,8) 1.07(27,2) .72(18,3) 10 oz.
(284 gm)
7724A .84(21.3) 1.83(46,5) .66(16,8) .32(8,1) 9 oz.
(255 gm)
7824 1.25(31,8)  1.07(27,2) .72(18,3) 10 oz.
(284 gm)
7728A 2.50 ± .03(63,5) 3.00 ±.03(76,2) .88(22,4) 2.30 ±.01(58,4) 2.75 ±0.1(69,9) 1.50(38,1) 1.63(41,4) 1.25(31,8) .71(18,0) .39(9,9) 6 oz. (170 gm)
7878 1.19(30,2) 1.02(25,9) .69(17,6) 8 oz.
(227 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.