Title :
On the design of a low noise readout circuit for in-vivo dosimeter
Author :
El Mourabit, A. ; Lu, Guo-Neng ; Pittet, Patrick
Author_Institution :
Nat. Sch. of Appl. Sci. of Tangier, Tangier, Morocco
Abstract :
The paper presents a readout circuit associated with photodiodes dedicated to an in-vivo dosimeter. The circuit consists of a fully differential charge sensitive amplifier (CSA) stage, a differential-to-single-ended amplifier stage and a buffered double sampling stage. The CSA implements a switched integration method to minimize dark current contribution to integrated output signal. Its fully differential operation rejects charge injection effect and further cancels dark current effect. Noise analysis is performed to identify main parameters for low-noise design. The double sampling stage is operated by non correlated double sampling (NCDS) to effectively reduce 1/f noise. The circuit operation is validated by transistor-level simulations.
Keywords :
CMOS integrated circuits; biomedical electronics; biomedical equipment; differential amplifiers; dosimeters; dosimetry; integrated circuit noise; low noise amplifiers; numerical analysis; photodiodes; CMOS detector-associated circuit; CSA; buffered double sampling stage; dark current contribution; differential charge sensitive amplifier; differential-to-single-ended amplifier; in-vivo dosimetry; low noise readout circuit; output signal; switched integration method; Circuit noise; Dark current; Differential amplifiers; Noise cancellation; Optical amplifiers; Optical pulses; Photodiodes; Probes; Sampling methods; Switches; charge sensitive amplifier (CSA); fully differential operation; in-vivo dosimeter; switched integration;
Conference_Titel :
Microelectronics (ICM), 2009 International Conference on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-5814-1
DOI :
10.1109/ICM.2009.5418587
