Millimeter-Wave Low Noise Amplifiers by Mladen Božanić & Saurabh Sinha

Author:Mladen Božanić & Saurabh Sinha
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Some popular LNA topologies are shown in Fig. 5.1 [3, 11–14]. Figure 5.1a–c are the basic configurations, and all the other LNA can be built or expanded by modifying either of the three basic configurations. Of course, as before, MOSFET in the circuit diagram can be replaced with any other active device discussed in Chap. 3, for example an HBT. All the topologies closely resemble the standard low-frequency amplifiers, except for the addition of the drain inductor or the RFC connected to the supply voltage in all figures but Fig. 5.1i, j, as well as the series inductor in the incoming signal path in all figures except Fig. 5.1i. This inductor is typically needed to resonate out the parasitic capacitances of the driving transistor. The gain of the LNA in each case is set so that the LNA noise figure dominates the noise of the cascaded system (the effect that was investigated in Chap. 2 already).

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