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SL523BCM Datasheet(Hoja de datos) 6 Page - Zarlink Semiconductor Inc

No. de Pieza. SL523BCM
Descripción  100MHz DUAL WIDEBAND LOG AMPLIFIER
Descarga  9 Pages
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Fabricante  ZARLINK [Zarlink Semiconductor Inc]
Página de inicio  http://www.zarlink.com
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SL523
Fig.9c Frequency response, detected output
TYPICAL PERFORMANCE
Unselected SL523B devices were tested in a wideband
logarithmic amplifier. described in RSRE Memo No 3027 and
shown in Fig 7
The amplifier consists of six logarithmic stages and two ‘lift’
stages, giving an overall dynamic range of greater than 80dB
The response and error curves were plotted on an RHG Log
Test Set and bandwidth measurements were made with a
Telonic Sweeper and Tektronix oscilloscope
Fig 8 shows the dynamic range error curve and f requency
response obtained. The stage gains of the SL523 devices
used were as shown in Table 1
The input v output characteristic (Fig.8a) is calibrated at
10dB/cm in the X axis and 1V/cm in the Y axis 80dB of dynamic
range was attained
The error characteristic (Fig 8b) is calibrated at 10dB/cm
in the X axis and 1dB/cm in the Y axis; this shows the error
between the log input v. output characterisitc and a mean
straight line and shows that a dynamic range of 80dB was
obtained with an accuracy of
±0.5dB
As a comparison, the log amplifier of Fig 7 was constructed
with randomly selected SL521 Bs (two SL521 Bs replacing
each SL523B). Again, a dynamic response of 80dB was
obtained (Fig 9a) with an accuracy of 1 0 75dB (Fig.9b)
Bandwidth curves are shown in Figs.8c and 9c, where the
amplitude scale is 2dB/cm, with frequency markers at 10MHz
intervals from 20 to 100MHz Using SL523Bs (Fig.8c), the
frequency response at 90MHz is 4dB down on maximum and
there is a fall-off in response after 50MHz Fig 9c shows that the
frequency response of the amplifier falls off more gradually
after 40MHz but again the response at 90MHz is 4dB down on
maximum
These tests show that the SL523 is a very successful dual
stage log amplifier element and, since it is pin-compatible with
the SL521 enables retrofit to be carried out in existing log
amplifiers It will be of greatest benefit however, in the design
of new log amplifiers, enabling very compact units to be
realised with a much shorter summation line
Table 1 Stage gains of SL523 used in performance tests
Max.
Stages
fo (MHz)
Gain (dB)
Deviation
(dB)
1
60
24.1 23
2
60
24.089
0.235
3
60
23.888
Lift
60
24.086
Fig.8a Input/output
Fig.8b Error curve
Fig.8c Frequency response, detected output
Fig.9a Input/output
Fig.9b Error curve
Fig.8 Characteristics of circuit shown in Fig 7 using SL523Bs
Fig.9 Characteristics of circuit shown in Fig 7 using SL523Bs




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