Image sensor with asynchronous sampling for improved frame rate

An image sensor comprising:

• an array of pixels;
• a plurality of row driver circuits configured to output row control signals to corresponding rows of pixels in the array;
• a reference row of pixels;
• asynchronous sampling circuitry having a plurality of sampling circuits, wherein each sampling circuit in the plurality of sampling circuits comprises a first input coupled to a column of pixels in the array and a second input coupled to the reference row of pixels;
• an additional row driver circuit configured to output row control signals to the reference row of pixels;
• and
• a delay circuit coupled between the plurality of row driver circuits and the additional row driver circuit.

An image sensor comprising:

• an array of pixels;
• a first row driver circuit configured to output row control signals to a row of pixels in the array;
• a timing row of pixels disposed along an edge of the array of pixels;
• a second row driver circuit configured to output row control signals to the timing row of pixels;
• and
• a delay circuit coupled between the first row driver circuit and the second row driver circuit.