TDA7110XT Infineon Technologies, TDA7110XT Datasheet - Page 29

• Manufacturer Part Number: TDA7110XT
• Manufacturer: Infineon Technologies

Specifications of TDA7110XT

• Operating Supply Voltage (max): 4V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Compliant

Wireless Components
The output power P
characterised by R
The power efficiency (and the bandwidth) increase when operating at a slightly
higher R
The collector efficiency E is defined as
The diagram of Figure 3-5 was measured directly at the PA-output at V
Losses in the matching circuitry decrease the output power by about 1.5 dB. As
can be seen from the diagram, 250 Ω is the optimum impedance for operation
at 3 V. For an approximation of R
two formulas can be used:
and
Figure 3-5
The DC collector current I
vary with the load resistor R
amplifiers. The collector current will show a characteristic dip at the resonance
frequency for this type of “overcritical” operation. The depth of this dip will
increase with higher values of R
E =
P
R
V
OUT
OPT
P
S
O
I
L
C
, as shown in Figure 3-5.
~
18
16
14
12
10
~
8
6
4
2
0
R
0
V
Output power P
OPT
S
L
100
> R
o
3 - 9
LC
is reduced by operating in an “overcritical” mode
c
.
o
of the power amplifier and the RF output power P
L
(mW) and collector efficiency E vs. load resistor R
. This is typical for overcritical operation of class C
200
RL [Ohm]
L
.
OPT
300
and P
OUT
400
at other supply voltages those
Data Sheet, December 2008
500
Pout [mW]
10*Ec
Applications
TDA7110
Power_E_vs_RL.pdf
S
= 3 V.
L
.
o