TRF6900
SINGLE-CHIP RF TRANSCEIVER
SLAS213C – SEPTEMBER 1999 – REVISED MAY 2000
power amplifier
The power amplifier (PA) can be programmed via two bits (P0 and P1 in the D-word) to provide varying output
power levels. Several control loops are implemented internally to set the output power and to minimize the
sensitivityofthepoweramplifiertotemperature, loadimpedance, andpowersupplyvariations. Theoutputstage
of the PA usually operates in Class-C and enables easy impedance matching. PA_OUT, terminal 5, is an open
collector output terminal.
↑1 U
CH1 S22
1
2
0.5
5
CAL
OFS
0
0.2
0.5
1
2
10
CPL
–5
1
FIL
1k
–2
–0.5
–1
START 850 MHz
STOP 950 MHz
Figure 22. Power Amplifier Output Impedance (S22) at Device Terminal 5
21
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
