STPAC01F2_08 Datasheet, PDF (1/7 Pages) STMicroelectronics – IPAD TM, RF detector for power amplifier control

STPAC01F2
IPAD™, RF detector for power amplifier control
Features
■ STPAC01F2 has two outputs
– one for the signal detection
– one for the temperature compensation
■ V_DCout = 0.88 V at 0.85 GHz at 10 dBm
■ V_DCout = 1.07 V at 1.85 GHz at 10 dBm
■ V_supply = 5 V max
■ Lead-free package
Benefit
■ The use of IPAD technology allows the RF
front-end designer to save PCB area and to
drastically reduce parasitic inductances.
Applications
Target applications are cellular phones and PDA
using GSM, DCS, PCS, AMPS, TDMA, CDMA
and 800 MHz to 1900 MHz frequency ranges.
Description
The STPAC01F2 is an integrated RF detector for
the power control stage. It converts RF signal
coming from the coupler into a DC signal usable
by the digital stage. It is based on the use of two
similar diodes, one providing the signal detection
while the second one is used to provide
temperature information to a thermal
compensation stage. A biasing stage suppresses
the detection diode drop voltage effect.
Flip Chip
(8 bumps)
Figure 1. Pin layout (bump side)
3
2
1
DC
out
V
Temp
A
Gnd1 Gnd1 Gnd2 B
RFin Gnd1 Bias C
Figure 2. Functional diagram
Coupler
RF input
VBIAS
RF detector
Low pass
filter
VDCOut
Thermal
compensation
STPAC01F2
Vtemp
GND1
GND2
April 2008
TM: IPAD is a trademark of STMicroelectronics.
Rev 2
1/7
www.st.com
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