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| MC33170 Datasheet, PDF (14/16 Pages) ON Semiconductor – RF Amplifier Companion Chip for Dual-Band Cellular Subscriber Terminal | |||
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MC33170
1: Tx Enable
2: GSM/DCS control pin
1: Tx Enable
2: Start-up in
Start-up current
68W//220nF
500mA/div
Figure 17a. Typical GSM/DCS pins response time
Complete dualâband application
Figure 18 shows how implementing the MC33170 in a
complete dualâband application where a 100kHz filter is
combined with the MOSFET driver.
Figure 17b. Peak current capability of the power switch
+ Battery
Modulation
Ramp
Chip Enable
Band
Selection
TX Enable
R8
R9
1k
19.88 k
1 Band
CE 14
2 TxEn Neg. Reg 13
3 GSM
Out 12
4 DCS Vboost 11
5 PA Start INV 10
6 GND NINV 9
7 Vbat
LDO 8
MC33170
C6
680 pF
C9 10 pF
R10
108 k
M2
MTSF3N02HD
C5
100 nF
C7
22 pF
R7
100 k
R6
100 k
C8
33 pF
GSM DCS Start
Zener
Vboost Power
Figure 18. A complete dualâband application with the MC33170
Application
The MC33170 has been designed to fulfill the
requirements of the new ON Semiconductor dualâband RF
amplifier, the MRFIC1859. For demonstration purposes, the
device was driven by the MC33170 in a simple gain two
configuration. The below picture shows how the power
signal drives the PAâs drain.
http://onsemi.com
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