Hi Fred,
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I've had a look at your circuit diagrams, and wondered if you could clarify a point for me.
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I'd assumed that placing an active current source, in place of the source resistor, would set the FET bias current. But you also include a gate bias voltage adjustment. How do these two interact ?
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I'd also have thought that the characteristics of the FET, and value of the source resistor, would have pretty much defined its bias point, regardless of any additional current source or voltage bias, but maybe I'm misunderstanding the architecture of FET circuits.
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Interesting stuff.
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Regards,
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Martin
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On Fri, Mar 21, 2025 at 01:28 PM, Fred M wrote:
A better way to improve large-signal handling is to replace the source resistor of the input FET with an active current source. This increases linearity and also reduces the gain loss of the source follower. I've done that with all my E-field Whip amplier designs (see link below)
