Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)

Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Optimization of Delta-Sigma ADC for Column-Level Data Conversion
Post: #1

Optimization of Delta-Sigma ADC for Column-Level Data Conversion in CMOS Image Sensors

.ppt  IMTC_2007_MJ.ppt (Size: 553.5 KB / Downloads: 34)

Solution (delta-sigma ADC)

Unlike Nyquist rate ADCs, oversampled ADCs (delta-sigma ADC) can filter the temporal noise in array sensors, achieving higher SNR.
Delta-sigma ADC is very tolerant to nonidealities of CMOS circuits.
Flexibility of trading the number of bits-per-pixel, with the frame rate in delta-sigma ADC is another advantage.
A few works have designed the DS-ADC for column or pixel level but with large power and area usage.
Main issue of DS-ADC is power consumption and area usage which should be minimized (subject of this work).

ADC structure in image sensors

Chip level ADC (One ADC for all of the pixels)
High spatial resolution
But, high noise, high power, fast ADC is needed,
Pixel level ADC (One ADC for each pixel or group of pixels)
Low noise, low speed ADC is needed, low power
But, low spatial resolution, high FPN.
Column level ADC (One ADC for each column or group of columns)
A compromise between pixel level and chip level.
In this work a first-order column-level delta-sigma ADC will be designed.

Operational Transconductance Amplifier

OTA is the most critical Component
Folded-cascode OTA structure with gain boosting was used.

DDA-CMFB circuit.

OTA needs a common-mode feedback (CMFB) circuit .
(1) Switched capacitor CMFB
It has large swing and linearity.
Loads the output of the OTA, reducing its UGB and SLR.Large area is needed
(2) We used a differential-difference amplifier CMFB (DDA-CMFB).
It can offer enough swing and linearity with very small area.
Post: #2
A delta-sigma analog-to-digital converter (ADC) is designed, optimized and simulated for converting column-level data into a CMOS image sensor. For a 0.18 mm process, the design reaches 80 dB signal-to-noise ratio (SNR), including a 10 dB margin for non-simulated kTC noise, and consumes 210 muW of power at a sampling frequency of 50 kHz . The low power is mainly realized using a architecture of first order and minimizing the capacitors. For the modulator, an optimized cascade folded-helmet (OTA) transconductance amplifier is optimized to achieve a gain of 90 dB with a unit gain bandwidth of 300 MHz. The decimator is also optimized by placing part of the circuit in the level of chip. Zero distortion is possible in the decimator due to the discrete time nature of the input signal. The proposed ADC allows a reduction in reading non-linearity of a CMOS image sensor, which allows a high SNR to be performed.

Marked Categories : folded cascode, delta sigma modulator ppt, column level sigma delta adc pixel sensor,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  data mining full report project report tiger 37 335,763,961 16-03-2019 05:22 PM
Last Post: TitkinWY
  visa processing system data flow diagram Guest 0 0 24-04-2018 11:11 PM
Last Post: Guest
  ulsb mk ii technical data Guest 0 0 27-03-2018 09:06 AM
Last Post: Guest
  column bypassing multiplier code verilog Guest 1 0 01-02-2018 10:52 AM
Last Post: dhanabhagya
  A Novel Data Embedding Method Using Adaptive Pixel Pair Matching Report project girl 3 2,594 15-01-2018 01:56 PM
Last Post: dhanabhagya
  crack for free vodacom data Guest 1 0 17-11-2017 12:10 PM
Last Post: jaseela123
  data flow diagram for ddos attack file type ppt Guest 1 0 07-11-2017 10:15 AM
Last Post: jaseela123
  516 n water level controller by vegakit Guest 1 0 25-10-2017 11:50 AM
Last Post: jaseela123
Wink bus repair system dfd 0 level Guest 1 0 25-10-2017 11:49 AM
Last Post: jaseela123
Sad conversion of microwaves into current Guest 1 292 14-10-2017 12:06 PM
Last Post: jaseela123
This Page May Contain What is Optimization of Delta-Sigma ADC for Column-Level Data Conversion And Latest Information/News About Optimization of Delta-Sigma ADC for Column-Level Data Conversion ,If Not ...Use Search to get more info about Optimization of Delta-Sigma ADC for Column-Level Data Conversion Or Ask Here