Patent ID: 6747879
Filing Date: 2004-06-08
Classification: H05K

Abstract:
A power amplifier comprising:a single circuit board having a plurality of subcircuits, including a high power gain subcircuit, thereon; the circuit board comprising multiple conductive layers including a first signal distribution layer, a second ground plane layer, a third signal distribution layer, and a fourth conductive layer separated from the third signal distribution layer by a dielectric layer and defining a fourth ground plane layer, the layers embedded in the circuit board, the second ground plane layer disposed between the first and third signal distribution layers, and the fourth ground plane layer being substantially metallized; the subcircuits including components mounted on the first signal distribution layer and controlled impedance circuits used for operation of such components, the second ground plane layer completing the controlled impedance circuits; a chassis body and a lid structure for coupling with the chassis body to contain the circuit board, the chassis body having a main surface formed thereon for mounting the circuit board; the substantially metallized fourth ground plane layer of the circuit board coupling directly with the main surface of the chassis body to provide a ground reference to the circuit board, the second ground plane layer being directly coupled with the fourth ground plane layer for providing proper grounding and shielding of the subcircuits; a plurality of walls integrally formed with the lid structure and extending from the lid structure and disposed for surrounding the subcircuits to electrically isolate the subcircuits from one another on the circuit board.