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low noise op amp for audio before going to adc

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nightcat38

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adc ti op amp

I want to design low noise op amp for audio application. The amplified audio signal will go to an ADC which is a 16 bit sigma delta. What is the noise requirement of the op amp? Can someone inform me how to design such low noise op amp? or someone direct me to the right place for info. Thx
 

hi nightcat38,

the total noise of amplifier should be samller than 1LSB of 16-bit ADC, and the closed-loop bandwidth of amplifier is larger than the signal bandwidth.

here
**broken link removed**
 

Regarding low noise amplifier design, I think the topic is basically covered by the textbooks as Razavi.

Classical low-noise audio amps are of the bipolar type. In the past, CMOS processes had difficulties to achieve an acceptable level of low frequency (1/f) noise, producing horrible amplifiers. Today, major manufacturers as TI have good CMOS LF amps. You should check specifications of your available processes regarding LF noise.
 

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