User Guide

RFMD RF5191 power amplifier implements amplification of the transmit signal to required power levels.
RF5191 amplifier is connected to VBAT.
The PA includes power detector for closed-loop power control purposes. Other parts in discrete front-end
include RF switches, baluns and band filters.
The transmitter section of WLAN module contains integrated baseband filter, mixer and a driver amplifier
with a variable output power.
The RF signal of WLAN module is filtered before PA. The signal goes after the (PA and TX/RX/Bluetooth
switches) to the RF bandpass filter.
The receiver is a direct conversion receiver. The received input signal is filtered with a ceramic bandpass filter
after which the TX/RX switch selects the receiver branch.
A balun before WLAN module transforms the single-ended signal to the balanced type. The IQ-modulator
down converts the signal into I and Q signals.
The channel filtering is performed with a low pass filter. The reference signal (38,4MHz) from the TCXO is
input to the WLAN module circuit (synthesizer). The RF oscillator core is running at double frequency, 5GHz.
A desired TX frequency of 2.4 GHz is generated by decreasing LO frequency by half.
Table 11 General RF specifications
Parameter Value
Supported channels 2412 - 2462 MHz (US bands)
2412 - 2472 MHz (EU bands)
Transmitter Power (max)
Barker/CCK (1, 2, 5.5, 11 Mb/s) 17dBm
OFDM-BPSK(6, 9 Mb/s) 15dBm
OFDM-QPSK(12,18 Mb/s) 15dBm
OFDM-16QAM (24, 36 Mb/s) 13dBm
OFDM-64QAM (48,54 Mb/s) 13dBm
Power control range 0 17 dBm
Receiver sensitivity (typical) 11M/bits. 1024
bytes / 8% PER
-84dBm
STLC4370A includes energy management IC that generates the required from the battery voltage VBAT. The
management unit has the following features:
• Four LDOs: 2 × 1.8 V, 2.8 V, 1.2 V
• Stepdown (disabled in STLC4370A)
• Stand-by mode for reduced quiescent current
• Power ON/OFF management
• Level-shifting for RF switches
• Thermal shutdown
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