Attached is an excerpt from Linear Technology's application note #118
I draw your attention to "D5" and "D6" --- Here a 'brace' of JFETs are employed in a so-called 'clamp' arrangement (I tend to favor the term 'clipper' inasmuch as level translation is not the point -- but to continue...) --- I must confess that I fail to see the advantage of such a scheme over a pair of 'fast' diodes?
Granted, the pictured arrangement would feature 'near infinitesimal' leakage current, still I can't 'shake' the feeling that I'm afflicted with a 'mental scotoma' as regards some essential property of JFETs and am, hence, missing 'the big picture'???
Any insight, ideas or idle musing will be greatly appreciated!
Many advance thanks!
HP
I draw your attention to "D5" and "D6" --- Here a 'brace' of JFETs are employed in a so-called 'clamp' arrangement (I tend to favor the term 'clipper' inasmuch as level translation is not the point -- but to continue...) --- I must confess that I fail to see the advantage of such a scheme over a pair of 'fast' diodes?
Granted, the pictured arrangement would feature 'near infinitesimal' leakage current, still I can't 'shake' the feeling that I'm afflicted with a 'mental scotoma' as regards some essential property of JFETs and am, hence, missing 'the big picture'???
Any insight, ideas or idle musing will be greatly appreciated!
Many advance thanks!
HP
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