To ensure adequate reception WiMAX transceiver dynamic range (Figure)-WiMAX, microwave, broadband wireless access - Communications Industry

To ensure adequate reception WiMAX transceiver dynamic range (Figure)-WiMAX

, microwave, broadband wireless access - Communications Industry

Is the BWA (broadband wireless access) is one kind of form, which is based wireless MAN ( MAN ) Of IEEE802.16 standard. It can be used for different applications, including the "last one mile" broadband connections, hotspots and cellular backhaul and business high-speed enterprise connectivity.

WiMAX provides fixed version IEE802.16d to fixtures NLOS (line of sight wireless) transmission, with 2 ~ 11GHz frequency range of about 4 ~ 6 miles transmission. This standard Mobile 802.16d 802.16e version is used in 2 ~ 6GHz frequency extension of mobile applications. This makes WiMAX Technology Can be built Notebook Or other mobile device. In the NLOS and mobile applications, the received signal level can be in a wide range of changes, requiring sensitivity and wide dynamic range receiver with a combination of low noise factor, to ensure that users expect the data rate of reliable Service .

Front-end LNA (low noise Amplifiers ) To establish the basic values when the noise factor and large the entire dynamic range receiver. By GaAspHEMT MM IC (Monolithic microwave IC ) Available 1dB noise factor, but with sufficient dynamic range is a difficult design task. Significantly expand the dynamic range performance of a method to increase a Switch Configuration, the switch configuration in the low-noise amplifier gain factor and does not require the automatic bypass amplifier, which is high because of the reasons for the received signal.

Avago Technologies has developed a GaAs pHEMTMMIC amplifier (MGA-71543), which contains an integrated bypass switch can work for low-noise external circuit optimization. For the receiver designer, than with discrete transistors and discrete switching elements of design is a simpler solution. Work in the bypass mode (significantly lower in the device automatically when the current selection), input and output through the transfer Saving Road to the internal matching, conditioning circuit to LNA input and output impedance of exactly the same, which for use in multiplexers, Filter Or between the amplifier is very important. Do not need high gain input with bypass switch helps to maintain the monitoring performance and lower power consumption (by reducing the total current to zero to achieve). Input and output do not match, but need a simple series / parallel Inductors To achieve low noise factor and the VSWR (Voltage Standing Wave Ratio) to 50 .

Figure 1 shows a single-stage amplifier circuit. Table 1 shows the amplifier (work at 3.3V Power supply , Power consumption 10mA) of board-level performance.

Integrated regulator bypass one of the advantages amplifier design is easy to cascade into two (Figure 2), it has greater flexibility. 1 and 2 is greater than 21dB amplifier cascade can increase the gain and noise factor of about 1.2dB (at 3.5GHz). Input and output return loss better than 10dB, operating current of about 21mA.

Bypass the first two lower gain of 6.3dB or so, but helps to maintain the input monitor performance and to reduce the total current consumption is about 10mA. As the noise level 1 factor dominated the overall amplifier noise factor, so get in the end the noise factor of about 1.8dB.

The strongest signal conditions, the two can be bypassed, leading to total approximately 11.4dB attenuation, while reducing the total current consumption to nearly zero.

With the detector and the lower circuit optimization, use 1 or 2 conditioning bypass the WiMAX receiver front-end LNA and variable in the different transmission paths to provide reliable performance.

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