Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

Post History

50%
+1 −1
Q&A What is the role of the differential amplifier in a delta sigma converter?

A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme the differential amplifier is substrac...

1 answer  ·  posted 4y ago by Pacifist‭  ·  edited 1y ago by Lorenzo Donati‭

#11: Post edited by user avatar Lorenzo Donati‭ · 2023-08-10T12:05:23Z (about 1 year ago)
Retagged.
#10: Post edited by user avatar Olin Lathrop‭ · 2020-12-02T00:08:03Z (almost 4 years ago)
Sentences start with upper case letters.
  • what is the role of the differential amplifier in a delta sigma converter?
  • What is the role of the differential amplifier in a delta sigma converter?
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. so based on this scheme
  • ![adc](https://electrical.codidact.com/uploads/skWRhAQCJmBrPMCxLzXNrATb)
  • the differential amplifier is substracting an input with a delayed input and outputing a tiny difference to the integrator and that is confusing.
  • so as mentioned in the title how does the differential amplifier behave or whats it role?
  • **Note:** am a beginner fascinated by electronics bear with me.
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. Based on this scheme
  • ![adc](https://electrical.codidact.com/uploads/skWRhAQCJmBrPMCxLzXNrATb)
  • the differential amplifier is substracting an input with a delayed input and outputing a tiny difference to the integrator and that is confusing.
  • So as mentioned in the title, how does the differential amplifier behave or whats is its role?
  • **Note:** am a beginner fascinated by electronics, bear with me.
#9: Question reopened by user avatar Olin Lathrop‭ · 2020-12-01T23:27:54Z (almost 4 years ago)
#8: Post edited by user avatar Pacifist‭ · 2020-12-01T20:36:24Z (almost 4 years ago)
  • what is the role of differential amplifier in a delta sigma converter?
  • what is the role of the differential amplifier in a delta sigma converter?
#7: Post edited by user avatar Pacifist‭ · 2020-12-01T20:33:21Z (almost 4 years ago)
  • differential amplifier in delta sigma converter
  • what is the role of differential amplifier in a delta sigma converter?
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
  • **edite/update:**
  • the questions were based on this scheme and other like it on internet
  • ![adc sc](https://electrical.codidact.com/uploads/QiD17ENG6HwhFXkpZA7YfBdj)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs. so based on this scheme
  • ![adc](https://electrical.codidact.com/uploads/skWRhAQCJmBrPMCxLzXNrATb)
  • the differential amplifier is substracting an input with a delayed input and outputing a tiny difference to the integrator and that is confusing.
  • so as mentioned in the title how does the differential amplifier behave or whats it role?
  • **Note:** am a beginner fascinated by electronics bear with me.
#6: Question closed by user avatar Olin Lathrop‭ · 2020-11-30T14:49:21Z (almost 4 years ago)
#5: Post edited by user avatar Pacifist‭ · 2020-11-29T20:52:38Z (almost 4 years ago)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
  • **edite/update:**
  • the questions were based on this scheme and other like it on internet
  • ![adc sc](https://electrical.codidact.com/uploads/QiD17ENG6HwhFXkpZA7YfBdj)
  • the updated schematic make more sense
  • ![new adc](https://electrical.codidact.com/uploads/JBeKpQubcGBdnW2kbD6vGoRu)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
  • **edite/update:**
  • the questions were based on this scheme and other like it on internet
  • ![adc sc](https://electrical.codidact.com/uploads/QiD17ENG6HwhFXkpZA7YfBdj)
#4: Post edited by user avatar Pacifist‭ · 2020-11-29T20:49:23Z (almost 4 years ago)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
  • **edite/update:**
  • the questions were based on this scheme and other like it on internet
  • ![adc sc](https://electrical.codidact.com/uploads/QiD17ENG6HwhFXkpZA7YfBdj)
  • the updated schematic make more sense
  • ![new adc](https://electrical.codidact.com/uploads/JBeKpQubcGBdnW2kbD6vGoRu)
#3: Post edited by user avatar Pacifist‭ · 2020-11-29T19:50:40Z (almost 4 years ago)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions look a little stupid bear with me and guide me that gonna be nice of you.
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions looks a little bit stupid bear with me and guide me that gonna be nice of you.
#2: Post edited by user avatar coquelicot‭ · 2020-11-29T19:47:13Z (almost 4 years ago)
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • so now the questions:
  • 1. why we need only the difference?
  • 2. in the delta-sigma converter why we are substracting an input with an delayed input?
  • 3. why we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics I did a lot of reading before I post my questions here so if my questions look a little stupid bear with me and guide me that gonna be nice of you.
  • A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs
  • VO = Ad (V1 - V2) **(ideal differential amplifier)**.
  • The differential Gain (Ad = – (R3 / R1))
  • CMRR = 20 logs (Ad / Ac)
  • ![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)
  • so as an example: V1=5.005 V2=4.995 Ad=100 **(ideal opamp)**
  • VO = Ad(V1 - V2)
  • VO = 100(5.005-4.995)
  • VO = 1 volt
  • Now the questions:
  • 1. why do we need only the difference?
  • 2. in the delta-sigma converter, why substracting an input with a delayed input?
  • 3. why do we need a differential amplifier in the delta-sigma converter?
  • Note: am a beginner fascinated by electronics. I did a lot of reading before I post my questions here so if my questions look a little stupid bear with me and guide me that gonna be nice of you.
#1: Initial revision by user avatar Pacifist‭ · 2020-11-29T15:30:39Z (almost 4 years ago)
differential amplifier in delta sigma converter
A differential amplifier amplifies the difference between the two input voltages but suppresses any voltage common to the two inputs   
VO = Ad (V1 - V2) **(ideal differential amplifier)**.  
The differential Gain (Ad = – (R3 / R1))  
CMRR = 20 logs (Ad / Ac)  
![differencial amplifier](https://electrical.codidact.com/uploads/NBSzVcJ6Xt1DuYmKtCG5RdNT)  

so as an example:  V1=5.005  V2=4.995  Ad=100   **(ideal opamp)**  
VO = Ad(V1 - V2)  
VO = 100(5.005-4.995)  
VO = 1 volt

so now the questions:  

 1. why we need only the difference?
 2. in the delta-sigma converter why we are substracting an input with an delayed input?
 3. why we need a differential amplifier in the delta-sigma converter?

 Note: am a beginner fascinated by electronics I did a lot of reading before I post my questions here so if my questions look a little stupid bear with me and guide me that gonna be nice of you.