June 12th, 2016 marks the 5th anniversary of Jim Williams’ death. Build something analog today, in his honor!
It’s time for another Jim Williams analog IQ test! Today we examine the design, operation, and limitations of a simple voltage to frequency converter.
This week’s analog IQ test leads us down the road of BJT temperature sensors, delta Vbe’s, and diode theory! But how well does the theory hold up in the real world?
|PN junction temperature curves||The Effect of Temperature on Diode Characteristics, Concepts Electronics|
|Accurate Temperature Sensing with an External P-N Junction||Linear Technologies Application Note 137, Michael Jones|
|The Brokaw band-gap circuit, explained by Paul Brokaw himself!||A Transistor Voltage Reference and What the Band-Gap Has To Do With it, A. Paul Brokaw|
|Measured temperature vs Vbe characteristics||What’s All This VBE Stuff, Anyhow?, Bob Pease|
It’s time for another analog IQ test, courtesy of Jim Williams! Can we identify and stop the source of oscillation in a simple voltage reference circuit?
Today we examine question #22 from Jim Williams’ Test Your Analog Design IQ: How to get -20V out of an LM741 op-amp running from a +-15V supply?