The Design and Modeling of 2.4 GHz and 3.5 GHz MMIC LNA

The Design and Modeling of 2.4 GHz and 3.5 GHz MMIC LNA

Ching Wen Yip (Universiti Sains Malaysia, Malaysia)
DOI: 10.4018/978-1-60566-886-4.ch007
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LNA is an electronic amplifier that is required in receiver systems to increase the amplitude of the very low level signals from the antenna without adding too much noise. Software Advance Design System (ADS) was used to simulate the circuit and design the layout. LNA was designed using cascode topology with feedback techniques which produces better matching and unconditionally stable over the entire desired frequencies. For the 2.4 GHz operation, the amplifier achieves gain of 14.949 dB, noise figure of 1.951 dB and input reflection coefficient of -10.419 dB. With operating voltage supply at 3V, the total current consumption is 13 mA. For 3.5GHz amplifier, gain is 22.985 dB, noise figure is 1.964dB, input reflection coefficient is -12.427 dB and current consumption is 18 mA.
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The LNAs to be designed are at 2.4 and 3.5 GHz. All these design can be applied in RF front end applications. Table 1 shows the LNA applications at a different frequency operation.

Table 1.
Low noise amplifier applications
0.9 GHzCellular phone
2.4 GHzWiFi
3.5 GHzWiMax base station, W-CDMA
5.5 GHz     802.11a application, Hiperlan2 Portable WLAN

The LNA specs that we have to achieve are shown in Box 1 and Table 2.

Table 2.
ParameterTypical Value
StabilityMore than 1
Noise Figure, NF0 dB - 2 dB
Associated Gain16 dB – 23 dB
Input P1dBMore than -10 dBm
Input IP3Less than 1 dBm
Drain Current, Idd at 1 dB Gain Compression Point9 mA – 20 mA
Input Return Loss (S11)- 10 dB
Output Return Loss (S22)- 10 dB
Box 1. Operating conditions
Operating Conditions:-
Vdd = (2.5 to 3) VImpedance Matched Zin/Zout = 50Ω
Vbias = (-1 to 0) VPin = 0 dBm

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