[Premium-Rx] General Coverage Antennas for HF

[Richard Reich]

An improvement to this circuit....?

It seems to me that the linearity and performance of the whole amp is determined
by the first stage. For it to behave as a super-linear amplifier, the drain of
the input E212 must `see` an infinitely high impedance. 
Although the bipolar device is good (giving about 2%-5% current stability) - it
can be much improved upon with other methods.
I would replace the bipolar transistor constant current source (2N3906) with a
constant current generator circuit using an IC. 

I suspect the IP3 will be further improved, and will give this a try when I have
a moment.

For the very high value resistor - I have measured some IC ESD packaging plastic
- which might work. 

Richard
***************************************************************
Richard Reich    
Principal Engineer Hardware
SAAT Technology Ltd
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