Abstract: An image sensor may include an array of image sensor pixels. Pixel control circuitry may provide control signals to the array of image sensor pixels. The pixel control circuitry may include a plurality of driver units that each generate a control signal for a different set of image sensor pixels. The control signal generated by each of the driver units may be delayed relative to each other. A voltage-controlled delay line may provide delayed outputs to each of the driver units. Delay lock circuitry coupled to the voltage-controlled delay line may fix the delay exhibited across the delay line using corresponding global and local bias voltages provided to each of the inverters in the delay line.