Samuel Groner
Well-known member
Hi
Recently re-read this page on CFP design:
www.dself.dsl.pipex.com/ampins/discrete/cfp.htm
Quote: The value of Rc is crucial to good linearity, as it sets the Ic of the first transistor, and also determines its collector loading.
The design he shows has Rc = 3k3. However, I'd like to use CFPs for input stages where I want much higher Ic for the first transistor (for lower noise) than such high values would allow; typically I got down to values between 68 and 680 ohm. With these values, is there any linearity improvement over a simple emitter follower?
As always, any insight greatly appreciated!
Samuel
Recently re-read this page on CFP design:
www.dself.dsl.pipex.com/ampins/discrete/cfp.htm
Quote: The value of Rc is crucial to good linearity, as it sets the Ic of the first transistor, and also determines its collector loading.
The design he shows has Rc = 3k3. However, I'd like to use CFPs for input stages where I want much higher Ic for the first transistor (for lower noise) than such high values would allow; typically I got down to values between 68 and 680 ohm. With these values, is there any linearity improvement over a simple emitter follower?
As always, any insight greatly appreciated!
Samuel