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BGA2776 Datasheet(PDF) 4 Page - NXP Semiconductors |
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BGA2776 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 10 page NXP Semiconductors Product specification MMIC wideband amplifier BGA2776 APPLICATION INFORMATION Figure 2 shows a typical application circuit for the BGA2776 MMIC. The device is internally matched to 50 Ω, and therefore does not need any external matching. The value of the input and output DC blocking capacitors C2 and C3 should be not more than 100 pF for applications above 100 MHz. However, when the device is operated below 100 MHz, the capacitor value should be increased. The nominal value of the RF choke L1 is 100 nH. At frequencies below 100 MHz this value should be increased to 220 nH. At frequencies above 1 GHz a much lower value must be used (e.g. 10 nH) to improve return losses. For optimal results, a good quality chip inductor such as the TDK MLG 1608 (0603), or a wire-wound SMD type should be chosen. Both the RF choke L1 and the 22 nF supply decoupling capacitor C1 should be located as closely as possible to the MMIC. Separate paths must be used for the ground planes of the ground pins GND1 and GND2, and these paths must be as short as possible. When using vias, use multiple vias per pin in order to limit ground path inductance. Figure 3 shows two cascaded MMICs. This configuration doubles overall gain while preserving broadband characteristics. Supply decoupling and grounding conditions for each MMIC are the same as those for the circuit of Fig.2. The excellent wideband characteristics of the MMIC make it and ideal building block in IF amplifier applications such as LBNs (see Fig.4). As a buffer amplifier between an LNA and a mixer in a receiver circuit, the MMIC offers an easy matching, low noise solution (see Fig.5). In Fig.6 the MMIC is used as a driver to the power amplifier as part of a transmitter circuit. Good linear performance and matched input and output offer quick design solutions in such applications. handbook, halfpage MGU436 RF out RF in C1 L1 C2 C3 GND2 GND1 Vs Vs RF input RF output Fig.2 Typical application circuit. handbook, halfpage DC-block 100 pF DC-block 100 pF DC-block 100 pF input output MGU437 Fig.3 Simple cascade circuit. handbook, halfpage from RF circuit to IF circuit or demodulator MGU438 mixer oscillator wideband amplifier Fig.4 IF amplifier application. handbook, halfpage antenna to IF circuit or demodulator MGU439 mixer oscillator LNA wideband amplifier Fig.5 RF amplifier application. handbook, halfpage from modulation or IF circuit to power amplifier MGU440 mixer oscillator wideband amplifier Fig.6 Power amplifier driver application. Rev. 04 – 29 August 2007 4 of 10 |
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