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Dennis Feucht
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Seemingly Simple Circuits: Transresistance Amplifier, Part 2--Transimpedance Amplifier Dynamics
Dennis Feucht  
7/9/2018   Post a comment
In Part 1, the op-amp was approximated from a single-pole, finite gain amplifier to an infinite-gain, single-pole op-amp, and the gain of the transresistance amplifier circuit, shown repeated below, was derived. In this Part 2 we look at the consequences.
Stairstep Generator
Dennis Feucht  
7/2/2018   Post a comment
This is a throw-together project using junk box parts that can be useful whenever an interesting-looking waveform is needed for a demonstration or for the beginnings of a video test generator or curve tracer.
Seemingly Simple Circuits: Transresistance Amplifier, Part 1-- Approximating Op-Amps
Dennis Feucht  
6/16/2018   Post a comment
A seemingly simple circuit with only two components, an op-amp and a feedback resistor, is commonly used to convert a current to a voltage. This circuit is familiar as a photodetector or impedance-meter current-sense amplifier.
Oscilloscope Trigger Generators: Precision Synchronizers
Dennis Feucht  
6/10/2018   Post a comment
Oscilloscope triggering circuits can be adapted to other applications, as precision synchronizers.
Lead the Field in Electronics
Dennis Feucht  
5/16/2018   Post a comment
Hard copy electronic catalogs: Be bold, go old, and succeed
Buffer Amplifier Design
Dennis Feucht  
5/7/2018   Post a comment
Mixed-Signal Circuits, Part 2: ADC and DAC Dynamics, the w-Domain, and Feedback Loop Design
Dennis Feucht  
3/19/2018   Post a comment
In this part, we push forth to transfer functions in s and z of ADCs and DACs, then consider briefly how to design feedback loops that span the analog-digital boundary.
Mixed-Signal Circuits, Part 1: From s to z - The Discrete Complex-Frequency Domain
Dennis Feucht  
3/11/2018   Post a comment
This article series is a mini-tutorial on the discrete complex-frequency domain and its complex variable denoted as z
Units, Pseudo-Units, Scaling Factors, and Units Conversion
Dennis Feucht  
2/16/2018   2 comments
The additional connection between numbers and the physical world is achieved through the use of units
High-Efficiency Analog Amplifiers, Part 3: Optimal Parallel-Segmented Voltages
Dennis Feucht  
2/5/2018   Post a comment
Optimal parallel-segment amplifier voltages are derived so that for either resistive or constant-current loads, the power dissipation in the parallel transistors is the same.
High-Efficiency Analog Amplifiers, Part 2: Series and Parallel Segmented Amplifiers
Dennis Feucht  
1/6/2018   3 comments
Segmented amplifiers are analog amplifiers that switch on different transistors over the input-waveform voltage range, thereby limiting the voltages across them and hence their power dissipation.
High-Efficiency Analog Amplifiers, Part 1: The Efficiency-Linearity Tradeoff
Dennis Feucht  
1/2/2018   Post a comment
Switching amplifiers, like switching power supplies, are more efficient than linear or analog amplifiers. However, the analog amplifier is not obsolete just yet; new circuit ideas improve its efficiency to be comparable to switching amplifiers. This article presents some of those ideas
Case Study: Medical Laser System; Part 4: Laser System Design
Dennis Feucht  
12/13/2017   Post a comment
In this fourth part, the design of the whole laser loop is completed, beginning with the dynamics
Case Study: Medical Laser System; Part 3: Laser Loop Dynamic Design
Dennis Feucht  
12/2/2017   Post a comment
In this third part, the goal is to design the dynamic compensation of a NdYAG laser power control loop to achieve stability within the static error (accuracy) requirements.
Engineering Home-Schooling
Dennis Feucht  
11/27/2017   2 comments
Is the ordinary college education the best route to become an engineer?
Case Study: Medical Laser System; Part 2: Photodiode Amplifier
Dennis Feucht  
11/13/2017   2 comments
The redesign goal was to make the original PDA design less noisy, simpler, less costly, and extended at the low end of the linear dynamic range to zero volts.
Case Study: Medical Laser System; Part 1: Stabilizing a Laser Feedback Control Loop
Dennis Feucht  
11/6/2017   2 comments
A medical laser company was having some technical problems with their NdYAG (neodymium yttrium aluminum garnet) laser development.
Alternative Uses of Packaging in Electronics
Dennis Feucht  
10/3/2017   Post a comment
In an era of collapsing economies, waning affluence, and too much garbage amid scarcity, a characteristic that is part of the engineering character - resourcefulness - is due to come back in vogue, as we are challenged to optimize the use of limited resources.
The Shape of Electronics Expertise
Dennis Feucht  
9/11/2017   2 comments
As we progress in our acquisition of electronics skills, we occasionally reflect on the “shape” that our knowledge and skills are taking. This article is an overview of basic decisions that “sculpt” our know-how and some of the consequences of the shape of it.
Sams Photofacts: A Needed Service Today
Dennis Feucht  
9/1/2017   2 comments
From a half century ago comes a “book” - or, more like a manual - one of a large set that became an electronics institution for decades: the Sams Photofacts
The Miller Effect, Part 4: The Inverse Miller-Effect Paradox
Dennis Feucht  
8/14/2017   Post a comment
There is a paradoxical “inverse Miller effect” that occurs in transistor amplifiers.
The Miller Effect, Part 2: The Generalized Single-Stage Amplifier
Dennis Feucht  
7/10/2017   4 comments
In the undergraduate active-circuits course in electronics engineering, the analysis of circuits is simplified, as it must be for introductory presentation.
Potentiometer Loading
Dennis Feucht  
6/5/2017   7 comments
Lead-Lag Pole-Zero Frequency Compensators, Part 2: Dual Passive and Active Compensators
Dennis Feucht  
5/6/2017   Post a comment
Part 2 continues with pole-zero compensators of feedback loops and presents some methods not usually found in textbooks
Complementary BJT Configuration
Dennis Feucht  
4/1/2017   4 comments
Popular Electronics Magazines and Books - Where Are They?
Dennis Feucht  
12/10/2016   13 comments
In the 20th century there have been three main American publishers of popular electronics books and magazines. All were founded by individuals who published material that bridged the hobbyist-technician-engineer gap
Electronics Lingo & Slang
Dennis Feucht  
11/15/2016   9 comments
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 6
Dennis Feucht  
11/1/2016   1 comment
Thin out your breathing mixture as we take the final plunge into TL431 dynamics and consider the output impedance. More strange creatures are sighted at this depth, yet all ends in a good dive
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 5
Dennis Feucht  
10/17/2016   7 comments
In this part, we go to greater depths to look at TL431 dynamics. Adjust your air regulator for the deeper dive. What is seen in the data sheet plots of gain and output resistance for some manufacturers is at first hard to believe.
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 4
Dennis Feucht  
10/3/2016   5 comments
We return for a second wind and to the surface for air as we catch our breath in Part 4 by considering two categories of application circuits for the TL431
How Technology Is Lost: Stories from Ancient and Recent History
Dennis Feucht  
9/13/2016   19 comments
In our time of global interaction, could technology be lost by war or other social factors? Loss need not be caused by a social event but merely by environmental factors. A trend in information technology is toward increasing fragility.
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 3
Dennis Feucht  
9/2/2016   24 comments
Now we plunge deeper in, to look at closed-loop output resistance, derive some formulas, then calculate transconductance and output resistance from manufacturer part data.
An Illustrated Guide to Transistor Amplifiers
Dennis Feucht  
8/23/2016   10 comments
The Author Explains Why Another Analog Circuits Book
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 2
Dennis Feucht  
8/12/2016   Post a comment
We submerge somewhat deeper into analysis of the seemingly simple TL431 voltage reference with transconductance amplifier to find that some useful design parameters are missing from the manufacturer specifications.
Seemingly Simple Circuits: The TL431 Voltage Regulator, Part 1
Dennis Feucht  
8/1/2016   4 comments
This six-part series not only covers the TL431 as such but also demonstrates multiple depths of analog understanding. The parts of the series proceed from snorkeling, to SCUBA diving, to pressure suits and even bathyscaphs.
The Calculator: An Important Engineering Tool
Dennis Feucht  
7/19/2016   11 comments
With the emergence of hand-sized computers, calculators have lost some of their former prominence, yet they continue to be a convenient and important engineering tool.
Common-Base Bypassing and How It Affects CB Frequency Response
Dennis Feucht  
7/8/2016   3 comments
The common-base (CB) BJT configuration is the second stage of cascode amplifiers. It is useful as a voltage translator to the high side of an amplifier with a large voltage range. This article addresses the question of how the RB, CB combination at the base node affects the frequency response.
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