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المؤلفTang, Fang
المؤلفBermak, Amine
المؤلفAbbes, Amira
المؤلفBenammar, Mohieddine Amor
تاريخ الإتاحة2023-04-05T08:36:43Z
تاريخ النشر2014
اسم المنشورThe Scientific World Journal
المصدرScopus
معرّف المصادر الموحدhttp://dx.doi.org/10.1155/2014/208540
معرّف المصادر الموحدhttp://hdl.handle.net/10576/41683
الملخصThis 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.
اللغةen
الناشرHindawi Publishing Corporation
الموضوعamplifier
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
العنوانContinuous-Time ΣΔ ADC with Implicit Variable Gain Amplifier for CMOS Image Sensor
النوعArticle
رقم المجلد2014
dc.accessType Open Access


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