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| TDA7100 Datasheet, PDF (31/41 Pages) Infineon Technologies AG – 434 MHz ASK/FSK Transmitter in 10-pin Package | |||
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TDA7100
Applications
the diagram, 550 ⦠is the optimum impedance for operation at 3 V. For an approximation
of ROPT and POUT at other supply voltages those two formulas can be used:
ROPT ~ VS
and
POUT ~ ROPT
10*E
Po [mW]
7
6
5
4
3
2
1
0
0
1000
2000
10*E
Po
3000
RL [Ohm]
Figure 17 Output power Po (mW) and collector efficiency E vs. load resistor RL.
The DC collector current Ic of the power amplifier and the RF output power Po vary with
the load resistor RL. This is typical for overcritical operation of class C amplifiers. The
collector current will show a characteristic dip at the resonance frequency for this type of
âovercriticalâ operation. The depth of this dip will increase with higher values of RL.
Data Sheet
31
V 1.0, 2007-05-02
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