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U4314B Datasheet(PDF) 5 Page - TEMIC Semiconductors |
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U4314B Datasheet(HTML) 5 Page - TEMIC Semiconductors |
5 / 7 page TELEFUNKEN Semiconductors U4314B Rev. A1: 26.06.1995 5 (7) 10 30 50 70 90 0 20 40 60 80 120 IF–Input Level ( dB mV ) 110 95 10462 100 +85 °C +25 °C –40 °C Figure 10. AM-demodulator characteristic (fin = 10.7 MHz) 0 2040 6080 0 10 20 30 40 70 IF–Input Level ( dB mV ) 100 95 10335 50 60 Figure 11. IAMout of U4314B in the application circuit of figure 12 (fin = 107 MHz) The following circuit is a mere proposal, how to improve sensitivity and extend the dynamic range of U4314B to more than 90 dB. However in most applications the basic dynamic range of more than 60 dB is sufficient. TEMIC TELEFUNKEN microelectronic GmbH makes no repre- sentation that the use of this circuit will not refringe on existing or future patents and no responsibility for the use of the information contained herein is assumed. This circuit is neither optimized concerning tolerances of the components nor tested versus temperature. It should work with a single supply voltage of 3 to 12 V. A npn transistor array CA3045 or similar is used. At least four transistors are needed to realize two current mirrors and the fifth acts as a preamplifier. The variable resistor P1 is used to com- pensate the quiescent current of the logarithmic demodulator output and may be replaced by a fixed resis- tor (typ. 3.3 k W). The total supply current depends on the IF-input level and varies between 2 and 7 mA. It is mainly determined by the current through the PIN diode. We recommend to use the BA679S PIN diode available from TEMIC TELEFUNKEN microelectronic GmbH. The input impedance of this application circuit is approxi- mately 1.5 k W || 13 pF. |
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