Philips Semiconductors | Product specification |
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MMIC wideband medium power amplifier | BGA6489 |
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APPLICATION INFORMATION
Figure 2 shows a typical application circuit for the BGA6489 MMIC. The device is internally matched to 50 Ω, and therefore does not require any external matching. The value of the input and output DC blocking capacitors C1 and C2 depends on the operating frequency; see the tables below. Capacitors C1 and C2 are used in conjunction with L1 and C3 to fine tune the input and output impedance. For optimum supply decoupling, a 1 μF capacitor (C5) can be added. The external components should be placed as close as possible to the MMIC. When using via holes, use multiple via holes per pin in order to limit ground path induction. Resistor R1 is a bias resistor providing DC current stability with temperature.
handbook, full pagewidth |
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| R1(2) |
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| VS |
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| C3 | C4 | C5(1) |
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| L1 |
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50 Ω |
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| 50 Ω |
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microstrip | C1 3 | 1 VD C2 | microstrip |
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| MGX419 |
(1)Optional capacitor for optimum supply decoupling.
(2)R1 values at operating supply voltage:
VS = 6 V; R1 = 15 W. VS = 9 V; R1 = 51 W. VS = 11.5 V; R1 = 82 W.
Fig.2 Typical application circuit.
Table 1 Component descriptions (see Fig.2)
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| VALUE AT OPERATING FREQUENCY | |||||
COMPONENT | DESCRIPTION | DIMENSIONS |
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500 | 800 | 1950 | 2400 | 3500 | ||||
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| MHz | MHz | MHz | MHz | MHz | |
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C1, C2 | multilayer ceramic chip capacitor | 0603 | 220 pF | 100 pF | 68 pF | 56 pF | 39 pF | |
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C3 | multilayer ceramic chip capacitor | 0603 | 1 nF | 1 nF | 1 nF | 1 nF | 1 nF | |
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C4 | multilayer ceramic chip capacitor | 0603 | 100 pF | 68 pF | 22 pF | 22 pF | 15 pF | |
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C5 (optional) | electrolytic or tantalum capacitor | 0603 | 1 μF | 1 μF | 1 μF | 1 μF | 1 μF | |
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L1 | SMD inductor | 0603 | 68 nH | 33 nH | 22 nH | 18 nH | 15 nH | |
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R1 | SMD resistor 0.5 W; VS = 9 V | − | − | − | − | − | − | |
2003 Sep 18 | 5 |
