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Feb 26th, 2013
Toshiba develops CMOS image sensor for small and low power applications
Toshiba Corporation (TOKYO:6502) announced the development of a CMOS image sensor with a small area and low power pixel readout circuits.
A sample sensor embedded with the readout circuits shows double the performance of a conventional one.(1) Toshiba presented this development at ISSCC 2013 in San Francisco, CA on Feb. 20.
As demand for commodity mobile phones takes off in emerging markets, CMOS image sensor need to be smaller, consume less power and offer low noise performance. The pixel readout circuits of CMOS image sensors are largely noise reducing correlated double sampling (CDS) circuits, along with a programmable gain amplifier (PGA) and an analog to digital converter (ADC). Serial signal processing architecture is best suited for securing conventional CMOS image sensors with a small area and low power pixel readout circuits, because a PGA and ADC can be shared by many CDS circuits placed in each column area of the sensor. However, smaller size and lower power are still challenges, since noise reduction circuits occupy a large area in the readout circuits, and PGA and ADC have high power consumption.
(1) Compared using Figure of Merit; FOM = power x noise / (pixels x frame rate)
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