Re: "active antenna preamplifiers" in ham radio May 1986
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A tour de force by Chris Trask!!
Re my previous suggestion of using constant current sources replacing R1 and R2 in Everett's great circuit, I leave the following quote by Chris....
>> The first of these circuits is shown in Fig.4. Here, the source load inductor of the KAA 1000 has been replaced with a JFET constant current source (Q2), where resistor R3 determines the bias current for the JFET source for Fig. 5 - Complementary Push-Pull Amplifier with Complementary Push-Pull Input Stage
lower (Q1). This active load provides a very high load impedance for the Q1 source follower, which in turn results in better IMD performance of the input stage.<<
best wishes
Paul VE3PVB Collingwood ON CANADA
On Friday, March 14, 2025 at 06:30:10 a.m. EDT, Martin - Southwest UK via groups.io <martin_ehrenfried@...> wrote:
Hi Hisami,
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This is the paper the design was taken from.
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Regards,
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Martin
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On Thu, Mar 13, 2025 at 11:27 PM, hisami dejima wrote:
Thanks also for the recommend on "Chris Trask (fig.5)".
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