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ADC14155 Datasheet(PDF) 2 Page - Texas Instruments |
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ADC14155 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page SIGNAL PATH designer® Tips, tricks, and techniques from the analog signal-path experts No. 111 Modern communication and measurement system designs are increasing in complexity as the latest high-performance proces- sors and DSPs enable new signal-processing techniques. As system requirements for speed and resolution increase, more capable Analog-to-Digital Converters (ADCs) emerge, and these in turn require higher-performance Analog Front Ends (AFEs). In many systems the AFE can be considered a key limiting factor in the overall system performance. Applications such as medical ultrasound, RADAR, Radio Frequency Identification (RFID), and video imaging similarly demand high-performance AFEs. AFE designers today are faced with the challenge of selecting the best amplifier to drive the ADC, including how to maximize the dynamic range of the signal path and how to choose the best filter for a given application. This article will address the design of high-speed data acquisition systems, including some of the limiting factors in the overall system performance created by the AFE and the clock driving the ADC. A generic AFE signal path including a source (Vs), Low-Noise Amplifier (LNA), ADC driver, channel filter, sampling clock, and ADC stages are shown in Figure 1. A key measure of any data-acquisition-system performance is the Effective Number Of Bits (ENOB) of resolution it delivers. The ENOB is maximized by minimizing the noise and distortion added by each stage of the AFE to the processed signal. A measure of the noise added by a particular stage is the noise factor, F, which is the total input referred noise of the stage divided by the input noise due to the previous stage. The often-quoted Noise Figure, NF, is 10 log F. Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths — By Mike Ewer, Principal Applications Engineer LNA ADC Driver ADC Channel Filter CLK Clock Driver CLK VS RS Figure 1. AFE Signal Path Feature Article ............... 1-9 GHz Amplifiers..................10 GSPS A/D Converters......11 SignalPathDesigner.indd 1 SignalPathDesigner.indd 1 9/5/07 3:24:28 PM 9/5/07 3:24:28 PM |
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