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UPC2746TB Datenblatt(PDF) 6 Page - California Eastern Labs |
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UPC2746TB Datenblatt(HTML) 6 Page - California Eastern Labs |
6 / 17 page Data Sheet PU10443EJ1V0DS 6 PC2745TB,PC2746TB TEST CIRCUIT EXAMPLE OF APPLICATION CIRCUIT The application circuits and their parameters are for references only and are not intended for use in actual design-ins. CAPACITORS FOR THE VCC, INPUT, AND OUTPUT PINS Capacitors of 1 000 pF are recommendable as the bypass capacitor for the VCC pin and the coupling capacitors for the input and output pins. The bypass capacitor connected to the VCC pin is used to minimize ground impedance of VCC pin. So, stable bias can be supplied against VCC fluctuation. The coupling capacitors, connected to the input and output pins, are used to cut the DC and minimize RF serial impedance. Their capacitance are therefore selected as lower impedance against a 50 load. The capacitors thus perform as high pass filters, suppressing low frequencies to DC. To obtain a flat gain from 100 MHz upwards, 1 000 pF capacitors are used in the test circuit. In the case of under 10 MHz operation, increase the value of coupling capacitor such as 10 000 pF. Because the coupling capacitors are determined by equation, fc = 1/(2 RC). |
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