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Circuit board design for IF/RF feedback amps

Posted: 24 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:amplifiers? parasitic capacitance? inductance?

When designing a printed circuit board (PCB), there are a few key considerations. High-speed amplifiers require good power supply bypassing, low parasitic capacitance on the input and output pins, and good termination of the signal paths. Providing power to a high-speed amplifier is difficult because the amplifier will draw both DC as well as AC power. The DC power is usually the easiest. The LMH6522, for example, contains four amplifiers and requires only 370 mA of current at a nominal 5V. The LMH6522 has a bandwidth of 1.4GHz. This means that the power supplies must be low impedance not only at DC, but also at 1.4GHz. This condition requires some special care. When selecting power supply bypass capacitors, the capacitors should offer a low impedance up to the amplifier 3dB bandwidth. That means that they should have a low series resistance and low parasitic inductance.

View the PDF document for more information.

Originally published by Texas Instruments at as "Circuit Board Design for LMH6517/21/22 and Other High-Speed IF/RF Feedback Amplifiers".

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