參數(shù)資料
型號(hào)： TDK5100
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK Transmitter 868/433 MHz
中文描述： 詢(xún)價(jià)/ FSK發(fā)射器433分之868兆赫
文件頁(yè)數(shù)： 31/40頁(yè)
文件大?。?/td> 629K
代理商： TDK5100
Output power and collector current vs. frequency
Applications
3 - 12
TDK 5100
Wireless Components
Specification, October 2002
As Figure 3-10 shows, detuning beyond the bandwidth of the matching circuit
results in an increase of the collector current of the power amplifier and in some
loss of output power. This diagram shows the data for the circuit of the test
board at the frequency of 434 MHz. The behaviour at 868 MHz is similar. The
effective load resistance of this circuit is R
L
= 700
, which is the optimum
impedance for operation at 3 V. This will lead to a dip of the collector current of
approx. 40%.
pout_vs_frequ.wmf
Figure 3-10
C3, L2-C2 and C8 are the main matching components which are used to
transform the 50
load at the SMA-RF-connector to a higher impedance at the
PA-output (700
@ 3 V). L1 can be used for some finetuning of the resonant
frequency but should not become too small in order to keep its losses low.
The transformed impedance of 700+j0
at the PA-output-pin can be verified
with a network analyzer using the following measurement procedure:
1. Calibrate your network analyzer.
2. Connect some short, low-loss 50
cable to your network analyzer with an
open end on one side. Semirigid cable works best.
3. Use the
Port Extension
“
feature of your network analyzer to shift the refer-
ence plane of your network analyzer to the open end of the cable.
4. Connect the center-conductor of the cable to the solder pad of the pin
PA
“
of the IC. The outer conductor has to be grounded. Very short connections
have to be used. Do not remove the IC or any part of the matching-compo-
nents!
5. Screw a 50
dummy-load on the RF-I/O-SMA-connector
6. Be sure that your network analyzer is AC-coupled and turn on the power
supply of the IC. The TDK5100 must not be in Transmit-Mode.
7. Measure the S-parameter S11
0
1
2
3
4
5
6
420
430
440
450
f [MHz]
Ic [mA ]
Po [dBm]
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參數(shù)描述
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