Patent ID: 6937482

Claim:
An amplifier comprising: a main amplifier subcircuit and an error amplifier subcircuit each directly mounted together on a single circuit board; a chassis body; a lid structure for positioning with the chassis body to contain the circuit board and main and error amplifier subcircuits; one of the lid structure and the chassis body having generally solid side walls extending therefrom for defining a main amplifier cavity with subcavities to contain subcircuits of the main amplifier subcircuit and an error amplifier cavity with subcavities to contain subcircuits of the error amplifier subcircuit, the side walls extending to contact the circuit board to isolate the subcircuits; the one of the lid structure and chassis body further including a generally solid dividing wall, of greater thickness than the side walls, extending between the main amplifier subcircuit and the error amplifier subcircuit, the dividing wall having multiple broad islands extending therefrom, the multiple islands passing through multiple cut-outs formed in the circuit board between the main amplifier subcircuit and respective cavity and the error amplifier subcircuit and respective cavity to electrically couple to the other of the lid structure and chassis body to separate the amplifier cavities and electrically isolate the main and error amplifier subcircuits.