Home |
Search |
Today's Posts |
#8
|
|||
|
|||
xpyttl wrote:
Jim Kortge, K8IQY, uses a cascode amp in his famous 2N2/40. He actually uses it in the transmitter ... even with a passive mixer you don't need a lot of gain on 40! See http://www.qsl.net/k8iqy .. There are two ways of looking at cascade, the devices are in series for dc and ac, or only ac. The above link shows the latter. I had an idea for a hybrid cascade amp of the first kind. The input would be a jfet which sorta becomes the emitter resistor for a bipolar transistor as the second stage of the cascade amp. The bipolar is run in grounded base (for ac, normal bias network and base bypassed to ground with a cap). Would give the advantages of high input impedance of the fet and high gain from the bipolar. |