The image recording apparatus records an image by ejecting ink onto a recording medium from a print head having a plurality of nozzles while moving the print head and the recording medium relatively to each other. In one aspect, the common mode output voltage is increased or decreased with respect to the common mode input voltage to enable high amplification of the signal input to the instrumentation amplifier. The same sensor that is used in gathering temperature readings may be used in gathering proximity sensor data or separate temperature sensor and proximity sensor detector structures may be used. The subset contains fewer than all of the active devices.