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Designing a phono pre. #1: high gain block
Designing a phono pre. #1: high gain block
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Old 6th November 2007, 07:20 AM   #11
Onvinyl is offline Onvinyl
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[QUOTE]Originally posted by peranders
It's a plain cascode, increasing the speed, lowering the distortion.

That's the piece I know. What I don't know is the advantage of biasing the cascodes base with a high impedance via a CCS.
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Old 6th November 2007, 08:16 AM   #12
peranders is offline peranders  Sweden
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Designing a phono pre. #1: high gain block
You want the voltage to be floating between the emitters of the input transistors and the emitters of the upper cascode transistors. A big cap + a high resistor value forms a floating voltage.
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