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How to enhance the performance of the signal path

2013-09-19
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How to Enhance Signal Path Performance: Signal path design provides system designers with many opportunities to play their part. For example, in a signal path with an ADC, engineers must not only buffer the sensor, but also address the input charging of the ADC switch capacitor and minimize the noise sources in the system. If the design can address these issues, the system performance can be greatly improved. This issue of the Signal Path Design Special will discuss this issue in depth. Buffering the Sensor If the sensor cannot drive the capacitive load of the ADC, an op amp can be used to buffer it. Since many systems only require a single power supply, it is important that the op amp is selected to operate at the same voltage as the ADC. Although sharing the supply voltage helps simplify the system design and save costs, the op amp is constrained by the supply voltage, so its input and output capabilities cannot be fully utilized. Taking analog/digital converter chips such as ADC121S101 as an example, since the reference voltage (VREF) of such chips is also the supply voltage, it is ideal to use an operational amplifier with rail-to-rail output (RRO) function such as LMP2011. Because the LMP2011 amplifier chip has rail-to-rail output function, system designers can use the entire dynamic range of the analog/digital converter to ensure that all output codes can be accessed.

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