Date: Tuesday, March 08 2022
Location: Chip
Time: 10:45 - 12:30
Press the button(s) below to test your knowledge and understanding of the topics covered this lecture.
Download the SLiCAP source files of the all pass filter
View the HTML output
The specifications are extracted from the application desicription and grouped in the file spec.py in the archive SLiCAP_antennaAssignment.zip
The applied antenna model is taken from: Equivalent Circuit of a Dipole Antenna Using Frequency-Independent Lumped Elements. The associated SLiCAP files are in the archive SLiCAP_antennaAssignment.zip. The results for the given antenna are shown in the HTML output.
Types of operational amplifiers
The operational amplifier was invented as a controller for analog computers. The “standard” operational amplifier has a floating (differential) voltage input and a grounded voltage output. Nowadays, different types of operational amplifiers exists.
Presentation
The presentation “OpAmps: types” briefly summarizes the historical development of operational amplifiers and lists the properties of the different types.
Presentation in parts
Video
Study
Chapter 8.1
Modeling of operational amplifiers
Manufacturers of operational amplifiers usually provide macro-models for SPICE simulation. Such models, however, do not provide design information.
Presentation
The presentation “Operational Amplifiers: modeling” presents techniques for modeling of specific behavioral apsects, for both SPICE simulators and for SLiCAP.
Presentation in parts
Operational Amplifiers: modeling (parts)
Videos
Study
Chapter 8.3
Slewing, phase reversal and clipping will be elucidated with a demonstration.
Feedback amplifiers with standard operational amplifiers as controllers
Operational amplifiers are intended to be used as controllers in negative feedback amplifiers. Standard operational (voltage) amplifiers use both supply terminals as return path of the output port. This complicates the implementation of output current sensing.
Presentation
The presentation “Feedback configurations with operational amplifiers” illustrates this and presents alternative current sensing techniques.
Presentation in parts
Feedback configurations with operational amplifiers (parts)
Video
Feedback amplifier configurations with operational amplifiers (6:37)
Study
Chapter 8.4.1
Synthesis of multiple-controller feedback configurations
If a feedback amplifier comprises multiple controllers, alternative configurations that all have the same ideal gain can be found by pairing the nullators and norators differently.
Presentation
The presentation “Multiple-nullor circuit synthesis” demonstrates this technique for an active-feedback inverting voltage amplifier.
Presentation in parts
Multiple-nullor circuit synthesis (parts)
Video
EE3C11 lecture 9: Multiple nullor Circuit Synthesis
Study
Chapter 7.6.1
Comparison table feedback structures
Design feedback configurations for the active antenna. You may use nullors as controllers, and transformers and passive network elements as feedback elements.
Evaluate the ideal gain of these configurations and verify the obtained results with SLiCAP.
Describe the effect of the passive elements in your configurations on the noise performance.
Verify your expectations with SLiCAP.
Describe the influence of the passive elements in your configurations on the power dissipation and the voltage and current-drive capability of the controller.
The input of the amplifier for the active antenna should be protected against overdrive and ESD. Consider this will be done with ESD protection diodes in parallel with the input. Those diodes suffer from:
A strong nonlinear V-I characteristic
A strong nonlinear Q-V characteristic
Current noise associated with leakage current
At this stage of the design, which of the your configurations shows the lowest impact of the input ESD protections on the signal processing quality? Please motivate your answer.
Make a comparison table for the design configurations that shows a qualitative comparison of performance aspects and cost factors at this stage of the design.
Two possible amplifier structures will be presented during the lecture, your task is to present two more.
You can download the SLiCAP files of the two solutions
