Head Office : Z.I. des Loges, rue de la Croix Blanche - 78350 Les Loges en Josas - France
Website :
www.vectrawave.com
• Phone : + 33 (0)619 870 560 • Fax : +33 (0)139 564 012 • Mail :
info@vectrawave.com
VectraWave Proprietary information subject to change without notice
46
2/8
RFIC : VWA 50011 AA
VWA 50011 AAAA DS Rev 0.2
DATA SHEET
VWA
P
P
r
r
o
o
d
d
u
u
c
c
t
t
-
-
L
L
i
i
n
n
e
Head Office : rue de la Croix Blanche - Immeuble LOGI – 78350 France
http://www.vectrawave.com
+ 33 (0)619 870 560
+33 (0)139 564 012
mail :
info@vectrawave.com
VWA 50011 AAAA DS Rev 0.2
VectraWave Proprietary information subject to change without notice
September 09 p 2 /8
Simplified Functional Block Diagram
PA
I/V
Peak detector
I1 ~ Vin
Vin ~ Power
Power
VSet
I2 ~ VSet
High gain amplifier
PA gain / power control
-
A part of the signal to the driver (PA) output is coupled to the peak detector. It uses two equivalent
devices, one being used as reference. The actual signal level is the difference between the detected
signal and the reference. The detected signal level is compared to the wanted value VSet and a High
gain amplifier is used to close the loop. The signal to the High gain amplifier output, which control the
driver level, is such that Vin ~VSet.
A scalling and offset can be done thanks to the use of the gm (I/V) device, loaded by a resistor
depending on specific needs t is possible to have Vin (Driver Output Level) = α x VSet + β.
For the WVA 50011 AA, α ~ 2, β = 0