Phase Shifter: Model 7929

Model 7929 Millimeter Wave 10 Bit Digital 360 Phase Shifter

Application Notes for Microwave Phase Shifters

The Model 7929 is a MMW PIN diode phase shifter covering the frequency range from 18 to 40 GHz providing a full 360° range of variable phase shift. Phase Shift Phase shifting is achieved utilizing the RF vector modulator approach shown in Figure 2. The 3dB hybrid coupler divides the RF signal into two quadrature components which are then biased in proportion to the sine and cosine of the desired phase shift. The signals are then combined in phase to yield desired output. Accuracy Improved phase accuracy and PM/AM performance are achieved by using double balanced biphase linear amplitude modulators. In the operating band, overall phase accuracy is better than 15°. Switching speed is better than 500 nsec.

Model 7929 phase shifter block diagram — Fig 1-Model 7929, block diagram

18 to 40 GHz
360° range
Incremental Resolution 0.35°
High speed
Digitally programmable (10 Bits)
Guaranteed monotonicity
Hermetically Sealed

Millimeter Wave 10 Bit Digital 360 Phase Shifter Model 7929 — PHASE SHIFTER MODEL 7929

RF vector modulator, Model 7929 phase shifter — Fig 2-RF Vector Modulator

PHASE SHIFTER SPECIFICATIONS

FREQUENCY RANGE (GHz)

INSERTION

LOSS (Max.)

VSWR (Max.)

ACCURACY(Max.)

PM/AM (Max.)

18.0-40.0

15.0 dB

INPUT: 2.5:1
J2

OUTPUT: 2.2:1

±15°

±2.0 dB

Operating Note: To initialized the unit after power up, at least one of the digital bits has to change its TTL level.

PERFORMANCE CHARACTERISTICS
Phase Shift
Range ....................................................	360° in 1,024 steps
Variation ................................................	0.1°/C°
Control Input ................................	10 bit TTL
Switching Speed ...................... (50% TTL to within 10° of Final Phase Value)	500 nsec max
Input IP2 .......................................	+60 dBm typ.
Input IP3 .......................................	+35 dBm typ.
Power Handling Capability
Without Performance Degradation .........................	+20 dBm
Survival Power .........................................	+30 dBm
Power Supply Requirements	+5V ± 5%, 125 mA max +12 to +15V, 10 mA max -12 to -15, 95 mA max

Model 7929 insertion loss vs frequency chart — Fig 3-Model 7929 Insertion Loss VS. Frequency (PM/AM)

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
18.0 to 21.4 GHz	7929-NB-1821	± 6^o (max.)	± 1.0 dB	13.0 dB (max.)
27.0 to 31.0 GHz	7929-NB-2731	± 6^o (max.)	± 1.0 dB	13.0 dB (max.)
33.0 to 36.0 GHz	7929-NB-3336	± 6^o (max.)	± 1.0 dB	13.0 dB (max.)
37.0 to 40.0 GHz	7929-NB-3740	± 10^o (max.)	± 1.0 dB	13.5 dB (max.)

ACCESSORY FURNISHED
Malting power/control connector
ENVIRONMENTAL RATINGS
Operating Temperature Range .....................................		-54° to + 95°
Non-Operating Temperature Range ............................		-65° to + 125° C	.



AVAILABLE OPTIONS
Option no	Description
7	Two K male rf connectors
10	One K male (J1) and one K female (J2) rf connector
49	High Rel screening per the following Table 1
G09	Guaranteed to meet Environmental Ratings
G12	RoHS Compliant
G16	RoHS and REACH Compliant

Table 1. Option 49 High Rel Screening - MIL - STD 883

TEST	METHOD	CONDITION
Internal Visual	2017	—
Temperature Cycle	1010	A
Mechanical Shock	2002	B
Burn-In	1015	—
Leak	1014	A1

DIMENTION AND WIGHT

Kratos Microwave Electronics Division (KMED)

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Model 7929 Millimeter Wave 10 Bit Digital 360 Phase Shifter

Operating Note: To initialized the unit after power up, at least one of the digital bits has to change its TTL level.

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