REP038: Application of MAX2648 in 5GHz WLAN
Abstract: This paper presents a design scheme to implement a 5GHz low noise amplifier (LNA) based on MAX2648. Use low-cost FR-4 PCB board.
| Rapid engineering prototypes (Rapid engineering prototypes) are the actual circuits that Maxim application engineers build and conduct product testing in the laboratory. They can provide a starting point for new RF engineering designs. They are not used as evaluation test tools. |
The MAX2648 is a high-linearity, SiGe low-noise amplifier (LNA) designed specifically for 5GHz wireless LAN based on the 802.11a and HiperLAN2 standards. To reduce costs, the Duroid microstrip line on the MAX2648 evaluation board can be replaced with an FR4 substrate with coplanar waveguide lines. Use Agilent ADS â„¢ to simulate the topology of the evaluation board in the new coplanar structure.
PCB specifications| RF bottom height | 3.9mils |
| Plate height | 62mils (nominal value) |
| Transmission line structure | Grounded Coplanar Waveguide (CPWG) |
| width | 7.2mils |
| gap | 10mils |
| C10 to C11 | 75mils |
| C11 to U1 | 90mils |
Unless otherwise noted, all distances are from the center of the component pad to the center
| U1 to L1 | 45mils (U1 output pad center to L1 pad edge.) |
| L1 to C13 | 154mils |
| C13 to C15 | 21mils |
The performance of the MAX2648 tested on the low-cost liner is almost the same as the test result on the MAX2648 evaluation board, but due to the higher loss of the FR4 material, the noise figure characteristics are slightly reduced.
| Roger's 4350 evaluation board PCB measurement loss | .5dB |
| FR4 evaluation board PCB measurement loss | 1.2dB |
The MAX2648 has high gain, low noise, and high linearity, making it a driver amplifier for the first-stage LNA, LO buffer, or transmitter. It provides a gain of 17dB, a noise figure of 1.8dB and an IIP3 of 0dBm, while the current consumption is only 12mA. It is packaged in a 2 × 36 solder ball bare chip level (CPS) package with an external dimension of 1.0 mm × 1.5 mm.
figure 1.
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