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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

Question differential-amplifier ADC
#11: Post edited by user avatar Lorenzo Donati‭ · 2023-08-10T12:05:23Z (over 1 year ago)
Retagged.
Analog differential-amplifier
differential-amplifier ADC
#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.
Analog differential-amplifier
Analog differential-amplifier
#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.
differential-amplifier