MGA-23003 Datasheet, PDF (13/17 Pages) AVAGO TECHNOLOGIES LIMITED – 3.3-3.8 GHz WiMAX Power Amplifi er (3x3mm)

Application Circuit MGA-23003
Vdd1
Vdd2
47uF
10uF
0.1uF
10uF
100pF
100pF
RF In
BCTRL
0.1uF 100pF _100pF
11RRFFIInn
22GGNNDD
33GGNNDD
44BBCCTTRRLL
100pF
GNGDND1212
RFROFuOt u1t111
GNGDN1D010
NCN9C 9
100pF
RF Out
BSPLY BSW PAMOD
Using 3.3V or 5V Supply and tying Vcc1, Vcc2, BSPLY and BCTRL
Vbat
R1
R2
Vcc1
Vcc2
BSPLY
BCTRL
3.3V Example :
_{VBCTRL = R2}
R₁ + R₂
*V<sub>BATT

2.8V =</sub> ^40KW _*3.3V
R1 + 40KW
R₁ = 7KW
R₂ = 40KW
Given :
V_BCTRL = 2.8V
V_BAT = 3.3V
R₂ = 40KW
R₁ = ?
Notes: BCTRL regulates the device current, thus R1 and R2 should have
good tolerance rating. If available, a voltage regulator is the preferred
method of bias.
In this example we set R2 at 40KOhm and solve for R1 with simple
voltage divider equation. Note this method will cause some leakage
current through R2.
5.0V Example :
_{VBCTRL = R2}
R₁ + R₂
*V<sub>BATT

2.0V =</sub> ^20KW _*5.0V
R1 + 20KW
R₁ = 30KW
R₂ = 20KW
Given :
V_BCTRL = 2.0V
V_BAT = 5.0V
R₂ = 20KW
R₁ = ?
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