mga-31289 Avago Technologies, mga-31289 Datasheet
mga-31289
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mga-31289 Summary of contents
Page 1
... The MGA-31289 is a complement of the Avago high-gain and high-linearity driver amplifier series as shown in Table 1. MGA-31289 is a 0.25 W mono- lithic microwave integrated circuit (MMIC) housed in a standard SOT-89 package – the preferred industrial package for low-power driver amplifiers due to its ex- ceptional thermal dissipation ...
Page 2
... PCB Material and Layer Stack Design Figures 1 and 2 show the top and bottom view respec- tively of the MGA-31289 demonstration circuit board and reveal the component placement. The demo board is a three-layer board containing a Coplanar Waveguide with Ground (CPWG) on the topside serving as RF traces and a solid metal ground plane on the backside ...
Page 3
... CPWG Design One can easily determine the dimension of the CPWG lines using AppCAD, the free and handy RF simulation software from Avago Technologies, as shown in Figure 4. An overall board thickness of 62 mil allows the use of SMA connec- tors from EF Johnson (142-0701-851) at both board edges. ...
Page 4
... Noise Figure (NF), linearity or gain in a system, as will be discussed in the following section with the aid of the 1.6 GHz design example intended for a Second Stage (Q2) BTS LNA application. MGA-31289 is tuned to meet the following specifications: 1. SSGain of 17- IIP3 (input third-order intercept point) should be better than +19 dBm 3 ...
Page 5
Figure 6 shows the suggested 1.6 GHz circuit (configura- tion number 6) with the component parts listed in Table 4. This configuration is recommended to provide the desired performance trade-off for IP3 and ORL while minimizing the material parts list. ...
Page 6
... L ORL is about -20 1.6 GHz. Figure 10 exemplifies the [3] . 1.6 GHz reverse isolation for MGA-31289 which is about -26.9 dB. As for linearity performance, the MGA-31289 produces 19.1 dBm of IIP3 and 22.7 dBm of OP1dB at 1.6 GHz. The NF for the device is about 2 1.6 GHz. Table 5 lists the MGA-31289’s performance at 1.6 GHz. ...
Page 7
... Frequency (GHz) Figure 10. Reverse Isolation Table 5. MGA-31289 performance summary at 1.6 GHz Parameter Frequency Input Return Loss (IRL) Small Signal Gain (SSGain) Reverse Isolation (ISO) Output Return Loss (ORL) Noise Figure (NF) Input Third-Order Intercept Point (IIP3) Output Third-Order Intercept Point (OIP3) ...
Page 8
... With proper input and output impedance matching of the MGA-31289 possible to produce an exceptionally good input return loss and at the same time, good linearity is guaranteed. ...