In honor of National Puzzle day here in the United States of America, I humbly present six op amp puzzles for you to puzzle on until your puzzler is sore – or at least until next week when I will publish the right answers! 

I’ve even provided you with some key op amp specifications to help in Figure 1.

PARAMETER

 

 

CONDITION

OPA735

UNIT

MIN

TYP

MAX

 

 

Vs=±5V

unless otherwise noted

 

 

 

 

Operating Voltage Range

VS

 

±1.35

 

±6

V

Common-Mode Voltage Range

VCM

 

(V-) -0.1

 

(V+) - 1.5

V

Short Circuit Current

ISC

 

 

±23.5

 

mA

Voltage Output Swing from Rail

VO

IOUT=+5ma (source)

 

4.70

 

V

 

VO

IOUT= +10ma (source)

 

4.44

 

V

 

VO

IOUT= +20ma (source)

 

3.85

 

V

 

VO

IOUT= -5ma (sink)

 

-4.81

 

V

 

VO

IOUT= -10ma (sink)

 

-4.62

 

V

 

VO

IOUT= -20ma (sink)

 

-4.00

 

V

Input Offset Voltage

VOS

 

 

1

5

uV

Input Bias Current

IB

VCM=VS/2

 

±100

±200

pA

Input Offset Current

IB

VCM=VS/2

 

±200

±300

pA

Figure 1: Key Op Amp Specification for OPA735

Without any further ado, let’s get puzzling!

Puzzle #1: What is Vout?

 

Puzzle #2: What is Vout?

Puzzle #3: What is Vout?

Puzzle #4: What is Vout?

Puzzle #5: What is Vout?

Puzzle #6: What is Vout?

Please do not post your answers so that those who are still puzzling can keep on puzzling, until next week when I publish the answers in my next blog post. I’ll be monitoring the comments and will jump in to answer questions and hints, if you get stuck.

A special thanks to my boss, Art Kay, for the starter seed of the idea for these op amp puzzles. 

Happy puzzling!

PS: If you thought this was fun, you might want to check out these posts from long-time TIer and retiree Bruce Trump.

 

 

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