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UPC2776 Datasheet(PDF) 4 Page - NEC |
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UPC2776 Datasheet(HTML) 4 Page - NEC |
4 / 12 page 4 µµµµPC2776TB TEST CIRCUIT VCC 1 000 pF 1 000 pF 1 000 pF C1 C2 L 4 6 1 2, 3, 5 50 Ω 50 Ω OUT IN C3 Components of test circuit for measuring electrical characteristics Example of actural application components TYPE VALUE TYPE VALUE OPERATING FREQUENCY C3 Capacitor 1 000 pF C1 to C3 Chip capacitor 1 000 pF 100 MHz or higher L Bias Tee 1 000 nH L Chip inductor 100 nH 100 MHz or higher C1 to C2 Bias Tee 1 000 pF 10 nH 1.0 GHz or higher INDUCTOR FOR THE OUTPUT PIN The internal output transistor of this IC consumes 20 mA, to output medium power. To supply current for output transistor, connect an inductor between the VCC pin (pin 6) and output pin (pin 4). Select large value inductance, as listed above. The inductor has both DC and AC effects. In terms of DC, the inductor biases the output transistor with minimum voltage drop to output enable high level. In terms of AC, the inductor make output-port impedance higher to get enough gain. In this case, large inductance and Q is suitable. 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 Ω 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, C = 1/(2 πRfc). |
Similar Part No. - UPC2776 |
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Similar Description - UPC2776 |
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