Pay attention to switch arrangement to improve PGA performance.(IdeasForDesign)(programmable-gain amplifiers)

From: Electronic Design | Date: April 12, 2007| Author: | Copyright information

Programmable-gain amplifiers (PGAs) are often used in communication systems, such as basestations. Designers can select fully integrated, single-IC PGAs, which are now available with bandwidths over 500 MHz. But obtaining the low second- and third-order distortion that is critical in communication applications isn't easily achieved.

[FIGURE 1 OMITTED]

Combine that with the desire for greater choice in the attenuation level and step size, and designers may opt to construct a PGA using a high-performance, fixed-gain amplifier with analog-switch and resistor ICs ahead of the ...

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