User Manual

operation.
DC is applied to the FET drains through L3, L4 for the Q1A half, and L5, L6 for
the Q1B half. L3 and L6 are short sections of microstrip line which transform
the apparent RF impedances of L4 and L5 to higher values as seen by the FET. RF
and lower frequencies are bypassed with paralleled C9, C10, and C17 for the "A"
half of the amplifier, and C11, C12, and C18 for the "B" half. These groups of
capacitors are selected in value and for their internal equivalent series
inductances so that they will be an effective bypass at critical frequencies of
interest, including video, to assist in maintaining stability. The connections
for C20 and C21 also assist in stability due to their return paths through the
ground plane of the output board. This connection provides a small amount of
negative feedback as a primitive means of neutralizing the amplifier.
The RF output leaves the board from J2.