Is there a single ended input single ended output amplifier integrated circuit? - Page 1
Forum section: electronics / projects

author: electronx
author_rank: Regular Contributor
timestamp: August 04, 2024, 10:49:46 am
content: Yes, nowadays everything is used as operational amplifiers with differential input , single ended output , or fully differential output (common mode rejection ratio is high, common mode noise is canceled.) These can also be used as single ended. However, the question I'm curious about is this. I've worked with amplifiers that contain discrete single ended input and single ended output before. So are there integrated circuits with single-ended inputs and single-ended outputs (past or present)?

author: Jacques
author_rank: Contributor
timestamp: August 04, 2024, 12:33:32 pm
content: You mean something like theBUF634A?

author: electronx
author_rank: Regular Contributor
timestamp: August 04, 2024, 01:31:09 pm
content: yeap likeBUF634AMAX2678BGU8M1UK

author: magic
author_rank: Super Contributor
timestamp: August 04, 2024, 04:03:44 pm
content: TL431, and it's a proper amplifier, with more than unity gain

author: SteveThackery
author_rank: Super Contributor
timestamp: August 04, 2024, 05:52:06 pm
content: Quote from: magic on August 04, 2024, 04:03:44 pmThat's a precision shunt regulator. I'm wondering if there is some kind of magic you can do with it.

author: electronx
author_rank: Regular Contributor
timestamp: August 04, 2024, 05:57:53 pm
content: +11111111

author: TimFox
author_rank: Super Contributor
timestamp: August 04, 2024, 05:59:48 pm
content: Quote from: SteveThackery on August 04, 2024, 05:52:06 pmI believe there are some amplifier circuits in the TL431 data sheets.Also, there are many single-ended ICs for RF amplifiers, with relatively simple internal circuits.

author: mawyatt
author_rank: Super Contributor
timestamp: August 04, 2024, 06:00:32 pm
content: Almost all the RF/MW type Integrated Amplifiers are Single Ended In/Out and usually 50 ohms nominal impedance.Best,

author: electronx
author_rank: Regular Contributor
timestamp: August 04, 2024, 06:38:11 pm
content: A finding: The differential input advantage was discovered with vacuum tubes, so when designing the IC, differential input amplifiers, which already existed and had known advantages, were designed instead of single-ended input.For this reason, integrated designers of that period (1950) turned to transistor-based opamps with differential inputs instead of directly fitting single-ended input amplifiers into the integrated circuit.

author: TimFox
author_rank: Super Contributor
timestamp: August 04, 2024, 07:24:34 pm
content: Also, it is easier to design ICs that require accuratematchingbetween pairs of semiconductors or resistors instead of accurate characteristics or resistances of single devices.Differential amplifiers are a natural use of matched devices.

author: magic
author_rank: Super Contributor
timestamp: August 04, 2024, 08:12:11 pm
content: Quote from: SteveThackery on August 04, 2024, 05:52:06 pmAdd a pullup resistor (or active load) to the cathode and it acts like an NPN with fairly accurate Vbe= 2.5V, Vce(sat) = 2V and gm = 5A/V.

author: PGPG
author_rank: Frequent Contributor
timestamp: August 05, 2024, 09:30:26 am
content: In 74HCU04 you have 6 single ended input single ended output amplifiers.

author: electronx
author_rank: Regular Contributor
timestamp: August 05, 2024, 10:24:12 am
content: Quote from: PGPG on August 05, 2024, 09:30:26 amthat thing is more digital than analog applications.

author: Someone
author_rank: Super Contributor
timestamp: August 05, 2024, 10:44:27 am
content: Quote from: electronx on August 05, 2024, 10:24:12 amNope:https://www.qsl.net/l/lu7did/docs/QRPp/TTL_74HC04%20As%20Linear%20Amplifier_SPRATCD.pdf"The 74HCU04 – A Miser's Dream"Many people have used the linear region of CMOS for fun and profit. If I want digital I'll go with some Schmitt triggers.

author: PGPG
author_rank: Frequent Contributor
timestamp: August 05, 2024, 01:14:27 pm
content: Quote from: electronx on August 05, 2024, 10:24:12 amApplication depends on designer.If you need digital you use 74HC04. Its unbuffered version (74HCU04) was created just to allow to use it as analog inverting amplifier (what is not possible with standard, buffered version).In my opinion it is exactly what you were asking about.