Datenblatt-Suchmaschine für elektronische Bauteile |
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SL523CBCM Datenblatt(PDF) 6 Page - Zarlink Semiconductor Inc |
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SL523CBCM Datenblatt(HTML) 6 Page - Zarlink Semiconductor Inc |
6 / 9 page 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 |
Ähnliche Teilenummer - SL523CBCM |
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Ähnliche Beschreibung - SL523CBCM |
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