Herley : MODEL 7928A
Page 1 of 6
Defense Electronics>
Microwave Products> Phase Shifters/Frequency Translators
View Printable Version
MODEL 7928A
How to Buy
Model 7928A Miniaturized 8 Bit Digital 360° Phase
Shifter/Frequency Translator
The Model 7928A is a miniaturized, hermetically sealed PIN
diode phase shifter covering the frequency range from 6 to
6 to 18 GHz
18 GHz providing a full 360° range of variable phase shift. It
360° range
can also be used to perform frequency translation. The unit
High speed
is an integrated assembly of an RF vector modulator and a
Digitally programmable (8 Bits)
driver circuit consisting of an 8- bit D/A converter and a
Guaranteed monotonicity
voltage buffer. See Figure 1.
Hermetically Sealed
Miniaturized: < 1.5 inches
3
PHASE SHIFT
Phase shifting is achieved utilizing the RF vector modulator
approach shown in Figure 2. The 3-dB 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 bi-phase linear
amplitude modulators. In the main operating band, overall
phase accuracy is better than 12°. The same phase
accuracy can be achieved at the band edges by using a
built-in frequency correction circuit. Switching speed is better
than 500 nsec.
FREQUENCY TRANSLATION
(SERRODYNING)
In the design of the Model 7928A, special attention has been
http://www.herley.com/index.cfm?act=product&prd=130
12/13/2007
Herley : MODEL 7928A
Page 2 of 6
paid to those characteristics which affect its performance as
a frequency translator. 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 band. 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 control requirements.
On special order, frequency translators can be provided for
operation over reduced bandwidths with suppression levels
of up to 40dB. Consult the factory for such requirements.
Model 7928A Specifications
PHASE SHIFTER SPECIFICATIONS
FREQUENCY RANGE (GHz)
INSERTION
VSWR
ACCURACY
PM/AM
http://www.herley.com/index.cfm?act=product&prd=130
12/13/2007
Herley : MODEL 7928A
Page 3 of 6
LOSS (Max.)
Main Band 8.0-18.0
Stretch Band 6.0-18.0
12.0 dB
(Max.)
2.0:1
(Max.)
±12°
±15°
(Max.)
±1.1 dB
±2.0 dB
FREQUENCY TRANSLATOR SPECIFICATIONS
TRANSLATION
RATE (Min.)
CARRIER
SUPPRESSION (Min.)
Main Band:
25 dB
Stretch Band:
18dB
NOTES:
(1)
SIDE BAND
SUPPRESSION
(Min)
Main Band:
20dB
Stretch Band:
15 dB
INSERTION LOSS
VARIATION (Max.)
with translation rate:
200kHz:
1dB
500kHz:
3dB
0 to 500 kHz
(2)
(1)
Main band specifications apply if 1 bit TTL logic signal is provided indicating
whether input rf signal is in mainband or bandedge.
(2)
All specifications are met using five or more most significant bits for 0 to
200 KHz translation rates. For 201-500 kHz translation rates, only the four most
significant bits are used.
PERFORMANCE CHARACTERISTICS
Phase Shift
Range
Variation
Control Input
Switching Speed
(50% TTL to within 10°
of Final Phase Value)
360° in 256
steps
0.1°/C°
8 bit TTL
500 nsec
max
Power Handling Capability
+10 dBm
Without Performance
(typically +13
Degradation
dBm)
+30 dBm
Survival Power
Power Supply
Requirments
+5V ± 5%, 80 mA
+ 12 to 15V, 10
mA
http://www.herley.com/index.cfm?act=product&prd=130
12/13/2007
Herley : MODEL 7928A
Page 4 of 6
Harmonics
-30 dBc
-12 to -15, 95 mA
ENVIRONMENTAL RATINGS
Operating Temperature Range
Non-Operating Temperature Range
-54° to + 95°C
-65° to + 125° C
ACCESSORIES FURNISHED
Mating power/control connector
AVAILABLE OPTIONS
Option no.
7
10
49
Description
Two SMA male rf connectors
One SMA male (J1) and one SMA female (J2) rf connector
High Rel screening per the following.
TEST
Internal Visual
Temperature Cycle
METHOD
2017.3
1010.5
CONDITION
--
B
http://www.herley.com/index.cfm?act=product&prd=130
12/13/2007
Herley : MODEL 7928A
Page 5 of 6
Mechanical Shock
Burn-In*
Leak
2002.3
1015.4
1014.2/.9
B
--
A1 & A2
* Burn-In temperature is + 110°C
http://www.herley.com/index.cfm?act=product&prd=130
12/13/2007
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
