Application Note: DDC Technology

Technical Note
C-Band
Dynamic Depressed Collector (DDC) Technology
Now you can have it all: SuperLinear® HPA cost savings in C-Band WITH full CW power.
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SuperLinear TWTA
CW TWTA
NEW DDC TWTA!
More than a decade ago, CPI introduced a simple
yet revolutionary product: the SuperLinear® high
power amplifier (HPA). As the only fully vertically
integrated HPA manufacturer in the world, we were
able to optimize the pairing of a CPI-manufactured
traveling wave tube (TWT) and the CPI manufactured
HPA power supply. This created significant power
efficiency improvements, which in turn led to
advancements in the amplifier’s size, weight and
reliability and cooling structure.
However, not all system operators have been in
a position to reap the efficiency benefits that
SuperLinear® TWTAs offer. Since SuperLinear® HPA
technology sacrifices the ability to run at peak power
(Psat) so that maximum efficiency can be achieved in
the linear operating performance range, those who
require occasional full peak output power have had
to rely on traditional HPAs. But with CPI’s new DDC
technology, that has changed: no longer must you
choose between high efficiency and high power.
For many full-time operators, this technology has
led to prime power cost reductions of thousands of
dollars per year per amplifier. HVAC costs and UPS
requirements have also been reduced. For other
operators, the smaller footprint of the HPAs has
allowed for more efficient and compact earth station
designs. CPI SuperLinear TWTAs are a very popular
choice for:
INTRODUCING DDC TECHNOLOGY
•
Fixed earth stations with high energy costs
•
Mobile uplinks for commercial and military
where size and weight are a premium; and
•
Systems driven by generators which consume
valuable fossil fuels.
The SuperLinear® TWTA is regularly chosen over
both GaN SSPAs and klystron amplifiers by many
operators because it simply makes good technical
and business sense to do so.
With the patented Dynamic Depressed Collector
(DDC) technology from CPI, you can alternate
between highest efficiency and CW modes on
the same amplifier at the touch of a button.
For more autonomous systems, the HPA can
automatically select the best mode of operation
based on your requirements. As with SuperLinear
HPAs, cost savings are quite dramatic versus
traditional TWTAs when operating at linear power
(see table on page 2), but when breakthrough power
is needed, the DDC HPA delivers that as well.
811 Hansen Way, PO Box 51625
Palo Alto, CA 94303 USA
tel:
+1 (650) 846-3803
fax:
+1 (650) 424-1744
e-mail:satcommarketing@cpii.com
website:www.cpii.com/satcom
Technical Note
Summary Dynamic Depressed Collector (DDC) Technology
DDC amplifiers are very appropriate for applications
that require occasional operation at high output
power levels, such as:
•
TT&C and IOT users who need max power
regardless of linearity
•
Uplinkers on the edge of a beam or in rain
fade conditions who rely on full power to
make their links reliable
•
Single carrier users who want to push higher
than 3 dB backoff
CPI is the world’s largest and oldest HPA
manufacturer, providing a full range of satellite
uplink amplifiers for all major commercial frequency
ranges, including SSPAs, TWTAs, and KPAs. Contact
CPI today to see how you can benefit from CPI’s
products, experience, and reliability.
The technology is currently available on the CPI
C-band 2.25 kW rack-mount TWTA, with more
frequency and power options to follow in 2016.
Line Voltage
(264 VAC)
C-Band Power
Consumed,
CW Mode
(kVA)
C-band
Power
Consumed,
SL Mode
(kVA)
RF Output
Power (W)
Annual
Savings,
Prime
Power (W)
No RF
3.260
2.852
0
408
$894
$8,935
45 dBm
3.351
2.770
32
581
$1,272
$12,724
48 dBm
3.398
2.742
63
656
$1,437
$14,366
51 dBm
3.407
2.755
126
652
$1,428
$14,279
54 dBm
3.464
2.929
251
535
$1,172
$11,717
57 dBm
3.967
3.482
501
485
$1,062
$10,622
60 dBm
4.600
4.245
1000
355
$777
$7,774
61 dBm
4.972
N/A
1259
N/A
N/A
N/A
62 dBm
5.355
N/A
1585
N/A
N/A
N/A
63 dBm
6.072
N/A
1995
N/A
N/A
N/A
Yearly Cost
Savings at
$0.25 per
kWH
10 Year
Savings
Typical cost savings, DDC in SuperLinear mode vs. CW 2.25 kW C-Band HPA
Patent Information
Dynamic Depressed Collector (DDC) technology is patented under
U.S. patent number 7,368,874 B2, dated May 6, 2008
MKT 414, ISSUE 3 dated OCT 2015