The DSLR-A290 has a better sensor type than most similar spec cameras that are a comparable age to it. This Sony digital camera has a CCD sensor type, whereas most SLR digital cameras that were launched around the same time as it have a MOS sensor type. CCD sensors produce high quality, low-noise images but consume a lot more power than CMOS sensors. CCD is the most common image sensor type used in digital cameras.
This digital camera's sensor type (CCD) is actually the best sensor type across all recently released cameras.
A MOS sensor type is the worst sensor type amongst similar types of digital camera.