Abstract: A constant gain, constant phase RF power block, e.g., for use in a RF amplifier apparatus. In a preferred embodiment, the power block includes a DC to DC power supply circuit co-located with an RF power transistor device on a common heat sink. The power supply circuit has as an input a varying DC voltage and as outputs a constant supply voltage and a constant bias voltage. The power device has as inputs the constant supply voltage and the constant bias voltage, and further configured to receive and amplify an RF signal. The power supply circuit preferably includes a first laser trimmable resistor for setting the constant supply voltage and a second laser trimmable resistor for setting the bias voltage. In this manner, the constant supply and bias voltages may be easily tuned to a desired level during assembly of the power block device. The input and amplified RF signals are each matched to a relatively high impedance, e.g., approximately fifty ohms.

Abstract: A cooling system for electronic components and printed circuit boards (PCBs) provides close thermal contact of a bulk coolant circulating through channels formed inside or on the surface of a multi-layer PCB carrying the electronic components, such that heat produced by the components is efficiently removed to a heat sink. The circulation channels may be formed by removing portions of layers, and inserting overlaying vias, during manufacturing or assembly of the PCB.