QPP-029 查看數據表（PDF） - Xemod -> Mprise
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QPP-029 Datasheet PDF : 3 Pages
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Performance at 28VDC & 25ºC (continued)
Parameter
Symbol
Min
IMD Variation – 100 kHz to 25 MHz tone spacing
2nd Harmonic at 35W Pout(single tone)
3rd Harmonic at 35W Pout(single tone)
Group (Signal) Delay
τd
Transmission Phase Flatness
CDMA ACPR at 7W Pavg
CDMA ACPR at 3.5W Pavg
Drain Efficiency at 7W CDMA
η
20
Drain Efficiency at 3.5W CDMA
η
12
Nom
1.0
-40
-45
3.5
0.5
-45
-48
23
14
Max
2.0
Units
dB
dBc
dBc
ns
degrees
dB
dB
%
%
Notes:
This QuikPAC module requires an externally supplied gate voltage (VGS) on the gate lead (pin 3) to set the operating point
(quiescent current- IDQ) of the power transistor. VGS may be safely set to any voltage in the range listed in the table. This
permits a wide range of quiescent current to be used. Since the operating characteristics of the module will vary as IDQ
changes, the bias setting will depend on the application. The data provided in the Performance section of this data sheet
was obtained with IDQ set to a value within the range listed (a nominal value ±10%). This particular value was chosen to
optimize gain, IMD performance, and efficiency simultaneously.
Gate voltage must be applied coincident with or after application of the drain voltage to prevent potentially destructive
oscillations. Bias voltages should never be applied to a module unless it is terminated on both input and output.
The VGS corresponding to a specific IDQ will vary from module to module. This is due to the normal die-to-die variation in
threshold voltage of LDMOS transistors.
Since the gate bias of an LDMOS transistor changes with device temperature, it may be necessary to use a VGS supply
with thermal compensation if operation over a wide temperature range is required.
Internal RF decoupling is included on all bias leads. No additional bypass elements are required, however some
applications may require energy storage on the drain leads to accommodate time-varying waveforms.
The RF leads are internally protected against DC voltages up to 100V. Care should be taken to avoid video transients that
may damage the active devices.
Xemod QuikPAC Data
QPP-029
www.xemod.com
Rev. B (04-10-02) Page 2 of 3
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