Differences

This shows you the differences between two versions of the page.

 university:courses:electronics:text:chapter-2 [29 Aug 2013 20:28]Doug Mercer [2.10.2 The Ideal Differentiator] university:courses:electronics:text:chapter-2 [06 Jun 2017 16:41]Doug Mercer [2.7 Inverting Summing Op Amp Stage] Both sides previous revision Previous revision 06 Jun 2017 16:44 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Jun 2017 16:44 Doug Mercer [2.8 The Differential Op Amp Stage] 06 Jun 2017 16:41 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Jun 2017 16:37 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Aug 2014 13:23 Doug Mercer minor edit31 Aug 2013 16:26 Doug Mercer [2: Introduction and Chapter Objectives] 29 Aug 2013 20:28 Doug Mercer [2.10.2 The Ideal Differentiator] 28 Aug 2013 17:07 Doug Mercer [2.10.2 The Ideal Differentiator] 28 Aug 2013 16:24 Doug Mercer created Next revision Previous revision 06 Jun 2017 16:44 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Jun 2017 16:44 Doug Mercer [2.8 The Differential Op Amp Stage] 06 Jun 2017 16:41 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Jun 2017 16:37 Doug Mercer [2.7 Inverting Summing Op Amp Stage] 06 Aug 2014 13:23 Doug Mercer minor edit31 Aug 2013 16:26 Doug Mercer [2: Introduction and Chapter Objectives] 29 Aug 2013 20:28 Doug Mercer [2.10.2 The Ideal Differentiator] 28 Aug 2013 17:07 Doug Mercer [2.10.2 The Ideal Differentiator] 28 Aug 2013 16:24 Doug Mercer created Next revision Both sides next revision Line 1: Line 1: - ======2: ​ Introduction and Chapter Objectives====== + ======Chapter ​2: Introduction and Chapter Objectives====== =====2.1 The Ideal Voltage Feedback Op Amp ===== =====2.1 The Ideal Voltage Feedback Op Amp ===== Line 80: Line 80: However, if the values of the resistors are too low, a great deal of current is required from the op amp output for proper operation. This causes excessive power dissipation in the op amp itself, which has many disadvantages. The increased dissipation leads to self-heating of the integrated circuit, which can cause a change in the dc characteristics of the op amp itself. ​ Also, the heat generated can eventually cause the junction temperature to rise above 150º C, the commonly accepted maximum limit for most semiconductors. The junction temperature is the temperature at the silicon chip itself. On the other end of the spectrum, if the resistor values are too high, there is an increase in noise and the susceptibility to parasitic capacitances,​ which can limit bandwidth and possibly cause instability and oscillation. ​   ​ However, if the values of the resistors are too low, a great deal of current is required from the op amp output for proper operation. This causes excessive power dissipation in the op amp itself, which has many disadvantages. The increased dissipation leads to self-heating of the integrated circuit, which can cause a change in the dc characteristics of the op amp itself. ​ Also, the heat generated can eventually cause the junction temperature to rise above 150º C, the commonly accepted maximum limit for most semiconductors. The junction temperature is the temperature at the silicon chip itself. On the other end of the spectrum, if the resistor values are too high, there is an increase in noise and the susceptibility to parasitic capacitances,​ which can limit bandwidth and possibly cause instability and oscillation. ​   ​ - From a practical sense, resistors below 10 ? and above 1 M? are more difficult to produce, especially if precision resistors are required. ​ + From a practical sense, resistors below 10 Ω and above 1 MegΩ are more difficult to produce, especially if precision resistors are required. ​ =====2.5 Inverting Op Amp Gain Derivation ===== =====2.5 Inverting Op Amp Gain Derivation ===== Line 136: Line 136: If all the input resistors R<​sub>​1,​ R<​sub>​2,​ ... R<​sub>​n​ are equal but not equal to R<​sub>​f​ then from the equation we can see that it can be simplified such that the output will be equal to the algebraic sum of the inputs times a common gain factor of -R<​sub>​f/​R<​sub>​1​. If all the resistors are made equal including R<​sub>​f​ then the output will be simply the negative sum of the inputs. If all the input resistors R<​sub>​1,​ R<​sub>​2,​ ... R<​sub>​n​ are equal but not equal to R<​sub>​f​ then from the equation we can see that it can be simplified such that the output will be equal to the algebraic sum of the inputs times a common gain factor of -R<​sub>​f/​R<​sub>​1​. If all the resistors are made equal including R<​sub>​f​ then the output will be simply the negative sum of the inputs. - **Lab Activity 1. [[university:​courses:​electronics:​electronics-lab-1|Simple Op Amps]]** + **ADALM1000 Lab Activity 1. [[university:​courses:​alm1k:​alm-lab-1|Simple Op Amps]]**\\ + **ADALM2000 ​Lab Activity 1. [[university:​courses:​electronics:​electronics-lab-1|Simple Op Amps]]**\\ + **ADALM2000 Lab Activity [[university:​courses:​alm1k:​alm-lab-vectrosumamp|Summing Amplifier]]** =====2.8 The Differential Op Amp Stage  ===== =====2.8 The Differential Op Amp Stage  ===== 