Single or dual differential? - Page 35

Elso Kwak · 16th April 2006, 08:27 PM

ppl,
Oops my U440s are from Intersil.
No U440 on www.fairchildsemi.com
Linear Systems did not bother to send me a sample....
I understand the boss of LS run away from Intersil.
HA-5142, HA2640, HA5160 f. a.
I do not hear much difference bewtween a U440 and a 2N3958A....
2SK389 is a completely different beast though. Hahahahaha

GEirin · 28th November 2007, 08:08 PM

Hi all.

I am very interested in to know the topology dual diff input the Phase Linear 400-700?
What is yours opinions?

Thanks
GEirin

john curl · 28th November 2007, 09:42 PM

This is a single diff input with a differential 2'nd stage.

GEirin · 28th November 2007, 09:53 PM

Thanks Mr. Curl.

Input: 2 diff.
Vas: single transistor

What is the purpose of the two diff.? Why?

john curl · 28th November 2007, 10:28 PM

Common mode rejection and maybe lower distortion.

GEirin · 28th November 2007, 11:27 PM

Un single differential stage, suffers from the disadvantage of asymmetrical clipping characteristics. In the Phase Linear, the configuration topology input produced symmetrical clipping?

lumanauw · 29th November 2007, 01:37 AM

This schematic is from 1974 RCA book. 2xRCA 1A11 performs input differential. 2xRCA 1A10 makes a differential level shifter. between bases of these 2xRCA 1A10 there are diode back to back, performing anti-clipping circuit (differential input is limited to 1 dioda drop each way). The left 1A10 has the collector grounded, the right 1A10 performs as VAS.
I think it is the anti-clipping mechanism that is aimed with this CCT.

28th November 2007, 09:42 PM	#343
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	This is a single diff input with a differential 2'nd stage. __________________ "Condemnation without Examination is Prejudice"

28th November 2007, 10:28 PM	#345
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	Common mode rejection and maybe lower distortion. __________________ "Condemnation without Examination is Prejudice"

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16th April 2006, 08:27 PM	#341
Elso Kwak Banned Join Date: Dec 2001 Location: Zamboanga, City of Flowers, Mindanao	ppl, Oops my U440s are from Intersil. No U440 on www.fairchildsemi.com Linear Systems did not bother to send me a sample.... I understand the boss of LS run away from Intersil. HA-5142, HA2640, HA5160 f. a. I do not hear much difference bewtween a U440 and a 2N3958A.... 2SK389 is a completely different beast though. Hahahahaha

28th November 2007, 09:53 PM	#344
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	Thanks Mr. Curl. Input: 2 diff. Vas: single transistor What is the purpose of the two diff.? Why?

28th November 2007, 11:27 PM	#346
GEirin diyAudio Member Join Date: Jun 2004 Location: Mendoza	Un single differential stage, suffers from the disadvantage of asymmetrical clipping characteristics. In the Phase Linear, the configuration topology input produced symmetrical clipping?

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