поискавой системы для электроныых деталей |
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VMMK-3803 датащи(PDF) 7 Page - Broadcom Corporation. |
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VMMK-3803 датащи(HTML) 7 Page - Broadcom Corporation. |
7 / 11 page 7 Figure 15. Biasing the VMMK-3803 Figure 13. Demo Board (available to qualified customers upon request) VMMK-3803 Applications Information Figure 14. Example demonstration circuit of VMMK-3803 for broadband operation (3GHz to 11GHz). Amp Input Vdd Output 100 pF 6.8 nH Vpd 0.1 µF 0.1 µF 100 pF 10 K 100 pF Output Pad Ground Pad Input Pad 50 Ohm line 50 Ohm line Biasing and Operation TheVMMK-3803 is biased with a positive supply connected to the output pinVd through an external user supplied bias decoupling network. Typical bias is 3 V at 20 mA. The “on” state also requires that the input port of the VMMK-3803 also be biased at 3 V for normal gain operation. 0V on the input puts the VMMK-3803 in the “off” state. An example of simple user supplied bias tees is shown in Figure 13. The output bias decoupling network feeding Vdd consists of a shunt 6.8 nH inductor. At the input, a 10 Kohm resistor is needed to feed the power-down control voltage. The input and output dc blocking capacitors are each 100 pF. The “on” and “off” S Parameters shown in the preceding tables reflect the operation of the circuit shown in Figure 14. Table 3. VMMK-3803 Demo Board BOM Component Value DUT VMMK-3803 C1 100 pF C2 100 pF R1 10 kohm C5 0.1 μF C6 100 pF L1 6.8 nH The input and output bias decoupling network can be easily constructed using small surface mount compo- nents. The value of the shunt inductors can have a major effect on both low and high frequency operation. The demo board uses small value inductors that have self resonant frequencies higher than the maximum desired frequency of operation. If the self-resonant frequency of the inductor is too close to the operating band, the value of the inductor will need to be adjusted so that the self- resonant frequency is significantly higher than the highest frequency of operation. Typically a passive component company like Murata does not specify S parameters at frequencies higher than 5 or 6 GHz for larger values of inductance making it difficult to properly simulate amplifier performance at higher fre- quencies. It has been observed that the Murata LQW15AN series of 0402 inductors actually works quite well above their normally specified frequency. The parallel combination of the 100 pF and 0.1 μF bypass capacitors provide a low impedance in the band of operation and at lower frequencies and should be placed as close as possible to the inductor. The low frequency bypass provides good rejection of power supply noise and also provides a low impedance termination for third order low frequency mixing products that will be generated when multiple in-band signals are injected into any amplifier. A layout of a typical demo board is shown in Figure 15. |
Аналогичный номер детали - VMMK-3803 |
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Аналогичное описание - VMMK-3803 |
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