Lecture 6: 25-11-2021

Location: D@ta

Time: 13:45 - 15:30

color coded resistors

Poll



Topics

Feedback stages

Feedback stages are negative feedback amplifiers with a single-stage controller. The controller can be a biased CS stage or one of its balanced versions.

Presentation

The presentation “Introduction to feedback stages” illustrates the way in which negative feedback can be applied to obtain stages with specific properties.

Video

EE4109 2020 7_1: Introduction to feedback stages

The CD stage

Feedback stages are negative feedback amplifiers with a single-stage controller. The controller can be a biased CS stage or one of its balanced versions.

Presentation

The name Common Drain Stage refers to the fact that the drain of the MOSFET is taken as the common terminal for the input and the output port of this stage. In analog electronics it is common practice to name amplifying stages according to their topology (CD stage, CG stage), their inventor (Gilbert Gain Cell, Wilson Mirror), their application (OPAMP), or their function (OTA, current mirror).

In structured electronic design, however, we like to emphasize that all amplifier stages can be obtained from the basis CS-stage through application of error-reduction techniques. From a viewpoint of design this has the advantage that the measure that has been taken to improve certain performance aspects of the basic stage is made explicit. In other words: the error reduction capabilities of the applied technique fully explain in which way and to what extend the properties of the modified stage differ from those of the CS stage.

The presentation “Common Drain Stage” shows that the CD stage can be viewed upon as a nonenergic feedback stage with a CS stage controller. By doing so, all performance aspects of the CD stage can be related to those of the CS stage, simply by considering the behavioral modifications resulting from the application of negative feedback.

Download

SLiCAP_python files for study of the stability and frequency compensation of a capacitively loaded CD stage: CDstage.zip.

Video

  1. EE4109 2020 7_2: Common Drain Stage

  2. EE4109 2020 7_3: Common Drain Stage SLiCAP Example

The CG stage

Feedback stages are negative feedback amplifiers with a single-stage controller. The controller can be a biased CS stage or one of its balanced versions.

Presentation

The name Common Gate Stage refers to the fact that the gate of the MOSFET is taken as the common terminal for the input and the output port of this stage. In analog electronics it is common practice to name amplifying stages according to their topology (CD stage, CG stage, cascode stage), their inventor (Gilbert Gain Cell, Wilson Mirror), their application (OPAMP), or their function (OTA, current mirror).

In structured electronic design, however, we like to emphasize that all amplifier stages can be obtained from the basis CS-stage through application of error-reduction techniques. From a viewpoint of design this has the advantage that the measure that has been taken to improve certain performance aspects of the basic stage is made explicit. In other words: the error reduction capabilities of the applied technique fully explain in which way and to what extend the properties of the modified stage differ from those of the CS stage.

The presentation “Common Gate Stage” shows that the CG stage can be viewed upon as a nonenergic feedback stage with a CS stage controller. By doing so, all performance aspects of the CG stage can be related to those of the CS stage, simply by considering the behavioral modifications resulting from the application of negative feedback.

Video

EE4109 2020 7_4: Common Gate Stage

Other feedback stages

Feedback stages are negative feedback amplifiers with a single-stage controller. The controller can be a biased CS stage or one of its balanced versions.

Presentation

The presentation “Other feedback stages” introduces feedback stages in which combination of techniques, such as, active feedback, passive feedback, indirect feedback and balancing have been applied.

Video

EE4109 2020 7_5: Other feedback stages

Demo

CD stage

SLiCAP analysis and design of the dynamic performance of a CD stage with/without isolated bulk: Chapter13.zip.