AR9271 View Datasheet(PDF) - Unspecified
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AR9271 Datasheet PDF : 152 Pages
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5.3 Synthesizer (SYNTH) Block
The radio supports one on-chip synthesizer to
generate local oscillator (LO) frequencies for
the receiver and transmitter mixers. The
synthesizer has the topology shown in
Figure 5-2.
The ARXXXX generates the reference input
from a 40 MHz crystal for the synthesizer. An
on-chip voltage controlled oscillator (VCO)
provides the desired LO signal based on a
phase/frequency locked loop.
Upon power up or channel re-selection, the
synthesizer takes approximately 0.2 ms to
settle.
Figure 5-2. Radio Synthesizer Block Diagram
5.4 Bias/Control (BIAS) Block
The bias/control block provides the reference
voltages and currents for all other circuit
blocks (see Figure 5-3). An on-chip bandgap
reference circuit provides the needed voltage
and current references based on an external
6.19 KΩ ±1% resistor.
Figure 5-3. Bias/Control Block Diagram
36 • AR9271 Single-Chip 1x1 MAC/BB/Radio for 802.11n WLANs
36 • November 2011
Atheros Communications, Inc.
COMPANY CONFIDENTIAL
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