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| DEMO-MGA-2XX03 Datasheet, PDF (11/16 Pages) Broadcom Corporation. – 2.3-2.7 GHz 3x3mm WiMAX and WiFi Power Amplifi er | |||
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Application Circuit MGA-22003
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 connecting Vcc1, Vcc2, BSLPY and BCTRL
Vbat
R1
R2
Vcc1
Vcc2
BSPLY
BCTRL
3.3V Example :
R2
VBCTRL =
*VBATT
R1 + R2
10Mï
2.85V =
*3.3V
R1 + 10Mï
R1 = 1.58Mï
R2 = 10Mï
Given :
VBCTRL = 2.85V
VBAT = 3.3V
R2 = 10M
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 10MOhm and solve for R1 with simple voltage
divider equation. Use high resistance values to limit leakage current.
5.0V Example :
R2
VBCTRL =
*VBATT
R1 + R2
10Mï
2.85V =
*5.0V
R1 + 10Mï
R1 = 7.54Mï
R2 = 10Mï
Given :
VBCTRL = 2.85V
VBAT = 5.0V
R2 = 10M
R1 = ?
11
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