Circuits and methods for achieving high linearity, high efficiency power amplifiers, including digital predistortion and pulse cancellation in switched-state RF power amplifier systems are described. The system displays runways, taxiways, connectors, ramps, gates, and buildings. The bit BLT operations perform the addition of pixels in the reference and error blocks. The interconnecting channels are configured such that substantially all of the heat collected by a working fluid is collected as the working fluid flows from the inlet manifolds away from the heat-transfer surface in a direction substantially normal to the heat-transfer surface.