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VectraWave Proprietary information subject to change without notice
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RFIC : VWA 50011 AA
VWA 50011 AAAA DS Rev 0.2
DATA SHEET
VWA
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Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
+ 33 (0)619 870 560
+33 (0)139 564 012
mail :
VWA 50011 AAAA DS Rev 0.2
VectraWave Proprietary information subject to change without notice
September 09 p 1 /8
VWA-50011 AA
Power Controller for high data rate
application
Description
The
VWA-50011 AA
is a power controller for
high data rate application. it is used into the TX
modules that are used to drive the data to the MZ
LiNbO
3
optical modulator. This type of device requires
a drive voltage of about 8 to 10V typically that has to
be continuously monitored and controlled.
The
controller has been developed with the Jazz SBC18
process, using its high speed HBT option in order to
integrate the detector on chip. Therefore, the chip can
directly be used into a module as GaAs PA companion
with no additional diode detector
.
For this type of application, the PA or data
driver is generally a GaAs distributed amplifier 100 KHz
to 15 GHz for a 10 Gbits/s application. Its output level
is coupled to the detector input in order to ensure a
level of about 1 Vpp. The controller input stage is a
peak detector, linear in linear (means that the detector
output level is proportional to the amplitude of the
signal and not to the power in dBm).
The power control principle consists in
comparing the detected power value to an external
wanted (set) value; the control loop modifies the PA
gain / power control DC voltage value in order to
match the wanted value to the set value. If a voltage
ramp is applied to the set value, the PA output
amplitude increases linearly.
The specification is closely linked to the high
data rate application, where there is no need for a
high control dynamic range, but for an accurate output
level control.
The detector is very application-specific:
this
is truly the part
that has to be redesigned
accordingly to the frequency, the dynamic and the
process. The main part, which is the controller core,
has been designed in CMOS. It is a design platform
which
is
used
into our
controller
family.
The
specifications
can be modified upon customer’s
requests.
Features
Temperature and process compensated
Dynamic range: linear from 0.2 to 1 Vp (no
damage): single ended input.
2.9
to 3.3V voltage supply.
Setting value from 0.3 to 1.8V full scale.
External 50Ω resistor to the match the detector
input
External capacitor for feedback loop stabilization.
Advantages
The level control using the VWA 50011 AA does not
have to be at “system level” as it is classically done.
The controller includes a peak detector which is
internally compensated (temperature and process). The
output level is only linked to the Set Value, applied to
the controller, independently of (Output-Level) VS (Gain
/
Level-Control) driver characteristics.
The driver characteristics dispersion (process) and
variation (temperature and aging) are compensated by
the control loop. A calibration at system level is no
longer required.
Applications
OC192-STM64-10GE long haul transmission
SONNET –SDH optical systems
Single MZ modulator solutions
RZ DPSK coding
