Zero-pole modulation and demodulation for noise reduction in charge amplifiers

A novel method of noise reduction, referred to as zero-pole modulation and demodulation, is proposed for charge amplifiers in imaging and sensor systems. In this method, the input signal is passed through a zero-pole system without being modified. However, the noise at the output of the charge ampli...

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Bibliographic Details
Main Authors: Jaffari, N., Vleugels, K., Wooley, B. A.
Format: Conference Proceeding
Language:English
Subjects:
CMOS integrated circuits
Demodulation
Detectors
Noise
Noise reduction
Poles and zeros
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Summary:A novel method of noise reduction, referred to as zero-pole modulation and demodulation, is proposed for charge amplifiers in imaging and sensor systems. In this method, the input signal is passed through a zero-pole system without being modified. However, the noise at the output of the charge amplifier is reduced by the demodulation. An experimental charge amplifier for applications in x-ray crystallography with zero-pole modulation-demodulation has been designed and integrated in a 0.18-μm CMOS technology. The circuit operates at a frequency of 10 kHz and has a conversion gain of 100 mV/fC. The amount of noise reduction achieved by the proposed method is 40%, which corresponds well to the theoretically expected noise reduction. The experimental charge amplifier exhibits an input-referred noise of 100 ENC.
ISSN:0886-5930
2152-3630
DOI:10.1109/CICC.2011.6055312