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Vol. 124, Issue 1, January 2011, pp.127-138

 

Bullet

Unspecified Low-Frequency Noise in Chopper Op-Amps

 

Charles Gilbert

NonDigital Design, 4319 Atlanta Hwy, Montgomery, Al 36109

Tel.: 865-604-404

E-mail: NonDigital@gmail.com

 

 

Received: 31 October 2010   /Accepted: 24 January 2011   /Published: 28 January 2011

 

Abstract: The low-frequency input noise-voltage of three precision chopper or auto-zero op-amps was measured over the span 0.001 Hz-10 Hz at ambient temperature and at constant temperature. It is seen that temperature should be controlled in order to observe the low-frequency self-noise of precision op-amps. It is then shown that chopper op-amp external network time-constants should be carefully adjusted, or eliminated altogether, in order to avoid degradation of the attainable noise-performance of some chopper or auto-zero op-amps.

 

Keywords: Noise, Op-Amps, Low-frequency, Auto-zero, Non-drift, Precision

 

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