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AuthorTang, Fang
AuthorBermak, Amine
AuthorAbbes, Amira
AuthorBenammar, Mohieddine Amor
Available date2023-04-05T08:36:43Z
Publication Date2014
Publication NameThe Scientific World Journal
ResourceScopus
URIhttp://dx.doi.org/10.1155/2014/208540
URIhttp://hdl.handle.net/10576/41683
AbstractThis paper presents a column-parallel continuous-time sigma delta (CTSD) ADC for mega-pixel resolution CMOS image sensor (CIS). The sigma delta modulator is implemented with a 2nd order resistor/capacitor-based loop filter. The first integrator uses a conventional operational transconductance amplifier (OTA), for the concern of a high power noise rejection. The second integrator is realized with a single-ended inverter-based amplifier, instead of a standard OTA. As a result, the power consumption is reduced, without sacrificing the noise performance. Moreover, the variable gain amplifier in the traditional column-parallel read-out circuit is merged into the front-end of the CTSD modulator. By programming the input resistance, the amplitude range of the input current can be tuned with 8 scales, which is equivalent to a traditional 2-bit preamplification function without consuming extra power and chip area. The test chip prototype is fabricated using 0.18 m CMOS process and the measurement result shows an ADC power consumption lower than 63.5 W under 1.4 V power supply and 50 MHz clock frequency.
Languageen
PublisherHindawi Publishing Corporation
Subjectamplifier
article
continuous time sigma delta
diffusion
diffusion coefficient
electric potential
energy consumption
nonlinear system
power spectrum
power supply
sensor
signal noise ratio
simulation
algorithm
theoretical model
Algorithms
Models, Theoretical
TitleContinuous-Time ΣΔ ADC with Implicit Variable Gain Amplifier for CMOS Image Sensor
TypeArticle
Volume Number2014
dc.accessType Open Access


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