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ECO7806 Schematic ( PDF Datasheet ) - Philips

Teilenummer ECO7806
Beschreibung WideBand Linear Power Amplifiers
Hersteller Philips
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Gesamt 30 Seiten
ECO7806 Datasheet, Funktion
APPLICATION NOTE
Wide-band linear power
amplifiers (470 860 MHz) with
the transistors BLW32 and
mBLW33
www.DataSheet4U.coECO7806
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ECO7806 Datasheet, Funktion
Philips Semiconductors
Wide-band linear power amplifiers (470 860 MHz)
with the transistors BLW32 and BLW33
Application Note
ECO7806
handbook, halfpage
50
L2
C1
C3 50
MGM418
Fig.3
handbook, full pagewidth
50
L2 C2
C1 L1
L3 C3 50
MGM419
Fig.4
handbook, full pagewidth
1998 mar 23
82
C1
4.2 pF
L'1
L2 C2
L3
C3 50
MGM420
Fig.5
6

6 Page









ECO7806 pdf, datenblatt
Philips Semiconductors
Wide-band linear power amplifiers (470 860 MHz)
with the transistors BLW32 and BLW33
Application Note
ECO7806
To get some idea of the reproducibility of practical amplifiers, two equivalent units have been built. They are screwed to
heatsinks having a thermal resistance of appr. 2 °C/W. So for an average ambient temperature of 25 °C the stud
temperature rises to about 48 °C for a power dissipation of about 11.5 W.
For the single amplifiers described, the straight forward method of small signal tuning at the S-parameter equipment and
afterwards the 2-tones test was followed. Via this method reliable results could be obtained.
However in case of the double amplifier it appeared to be rather difficult to find the optimum between an acceptable flat
gain curve and sufficient output power with low i.m.d.
Because there is a correlation between the single tone 1 dB compression point and the i.m.d. of a linear amplifier, the
following dynamic way of tuning was applied: For the BLW33 compression starts around 2 W output. The gain of the
complete amplifier is appr. 20 dB so appr. 20 mW (+13 dBm) drive power should be sufficient. This amount of swept
power is available from the sweep oscillator HP8620C in combination with RF plug-in unit HP86222A. Because of
internal ALC the swept output power level is very stable and almost unaffectable by the strong input VSWR variation of
the BLW32 amplifier.
For the BLW32, the channel 21 and 39 results are somewhat better (3 18%) when measured under 3-tone
conditions, whilst the channel 70 figures are about 6% lower.
In case of the BLW33, the 3-tone results are somewhat different for both tested units. As an average they are in
between those of the 2-tone test.
The gain figures are about the same. For a description of the 2-tone and 3-tone test chain and the way of testing one
is referred to Ref.3.
5 COMBINED AMPLIFIER WITH BLW32 AND BLW33
5.1 Practical considerations
As an experiment both amplifiers, being tuned for optimum performance, were cascaded. In that case the output of the
BLW32 has to accept the mismatch, specially at lower frequencies, caused by the BLW33 amplifier.
The gain (S21) becomes appr. 20 dB, whilst the input and output reflection damping of the combination show somewhat
different values. However, the trend is the same.
From this experiment the idea came to integrate both amplifiers on one printed-circuit board. The easiest solution was
the direct connection of the two 50 striplines, maintaining the blocking capacitor C1 (see Fig.12) and concentrating the
elements C11 (see Fig.11) and C2 (see Fig.12) in a new single tuning element.
Figure 26 shows the total circuit diagram, Fig.15 the printed-circuit board of the amplifier part and Table 9 the list of
components.
To create an amplitude variation the sweep generator is amplitude modulated (AM input) with a square wave pulse
generated with a PM5715 pulse generator.
The output of the amplifier under test is now again attenuated (about 20 dB), detected and supplied to an oscilloscope
being horizontally driven by means of the available sweep output of the HP8620C.
Figure 27 shows the block diagram of the measuring set-up, and Figs 28 to 30 screen pictures of the swept output power
for different input levels (+7, +10 and +13 dBm) in which compression is clearly shown. From above mentioned
experiments it appeared that the blocking capacitor, C12 in Fig.26, better could be decreased to 8.2 pF.
5.2 Measured results
Being tuned for a good large signal behaviour the i.m.d. results of both amplifiers constructed are given in Figs 31 and 32.
Figures 33 and 34 resp. show the gain curves for an input power of 5 mW (+7 dBm) and Figs 35 to 37 the S-parameter
results.
The peak sync. power for a 3-tone i.m.d. of 60, 56 and 52 dB has been measured at three channels. Table 6 shows
the 60 dB results for the combination no. (2).
1998 mar 23
12

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