Patent ID: 8742311

Claim:
A backside illumination (BSI) pixel array comprising: a transfer signal line having a first line impedance; a reset signal line having a second line impedance; a source follower power line having a third line impedance which is less than at least one of the first line impedance or the second line impedance; and a first pixel cell including: a photodiode to accumulate charge in response to light incident upon the photodiode; a transfer transistor having a gate coupled to the transfer signal line to selectively transfer the charge from the photodiode to a floating diffusion node; a reset transistor having a gate coupled to the reset signal line to selectively reset a voltage of the floating diffusion node; and a buried channel source follower transistor coupled between the source follower power line and a bit line, the buried channel source follower transistor including a gate coupled to the floating diffusion node to output an analog signal from the buried channel source follower transistor directly to the bit line.