Basic Circuits

Buffer (follower) circuit ............................................................................ 5

Inverting amplifier circuit ........................................................................ 9

Non-inverting amplifier circuit .............................................................. 14

Inverting summer circuit ....................................................................... 18

Difference amplifier (subtractor) circuit ................................................ 23

Two op amp instrumentation amplifier circuit ....................................... 27

Three op amp instrumentation amplifier circuit .................................... 31

Integrator circuit ................................................................................... 35

Differentiator circuit .............................................................................. 40

Current Sensing

Transimpedance amplifier circuit .......................................................... 45

Single-supply, low-side, unidirectional current-sensing solution with

output swing to GND circuit ................................................................. 49

Single-supply, low-side, unidirectional current-sensing circuit ............ 53

Low-side, bidirectional current sensing circuit ..................................... 57

High-side, bidirectional current-sensing circuit with transient protection .. 63

High-side current-sensing circuit design ............................................. 68

3-decade, load-current sensing circuit ................................................ 72

High-voltage, high-side floating current sensing circuit using current

output, current sense amplifier ............................................................. 76

Low-drift, low-side, bidirectional current-sensing circuit with integrated

precision gain resistors ......................................................................... 81

Overcurrent event detection circuit ...................................................... 86

Signal Sources

PWM generator circuit .......................................................................... 90

Adjustable reference voltage circuit ..................................................... 94

Current Sources

Low-level voltage-to-current converter circuit .................................... 97

Filters

AC coupled (HPF) inverting amplifier circuit .........................................101

AC coupled (HPF) non-inverting amplifier circuit .................................105

Band pass filtered inverting attenuator circuit ......................................109

Fast-settling low-pass filter circuit .......................................................113

Low-pass filtered, inverting amplifier circuit .........................................117

Non-Linear Circuits (Rectifiers/Clamps/Peak Detectors)

Half-wave rectifier circuit ...................................................................... 122

Full-wave rectifier circuit ...................................................................... 126

Single-supply, low-input voltage, full-wave rectifier circuit .................. 130

Slew rate limiter circuit ..........................................................................134

Signal Conditioning

Single-ended input to differential output circuit ...................................138

Inverting op amp with inverting positive reference voltage circuit ........142

Non-inverting op amp with inverting positive reference voltage circuit...146

Non-inverting op amp with non-inverting positive reference voltage

circuit ....................................................................................................150

Inverting op amp with non-inverting positive reference voltage circuit .154

Single-supply diff-in to diff-out AC amplifier circuit .............................158

Inverting dual-supply to single-supply amplifier circuit ........................162

Dual-supply, discrete, programmable gain amplifier circuit .................167

AC coupled instrumentation amplifier circuit .......................................171

Discrete wide bandwidth INA circuit ....................................................175

Low-noise and long-range PIR sensor conditioner circuit ...................179

Temperature sensing with NTC circuit .................................................183

Temperature sensing with PTC circuit ..................................................187

Differential input to differential output circuit using a fully -differential

amplifier ................................................................................................191

Single-ended input to differential output circuit using a fully-differential

amplifier ................................................................................................197

Comparators

Signal and clock restoration circuit ...................................................... 201

Comparator with and without hysteresis circuit ................................... 205

High-side current sensing with comparator circuit .............................. 209

High-speed overcurrent detection circuit ............................................ 214

Inverting comparator with hysteresis circuit ......................................... 219

Low-power, bidirectional current sensing circuit .................................. 224

Non-inverting comparator with hysteresis circuit ................................. 229

Overvoltage protection with comparator circuit ................................... 234

Window comparator with integrated reference circuit ......................... 238

Relaxation oscillator circuit ................................................................. 242

Thermal switch circuit ......................................................................... 246

Undervoltage protection with comparator circuit ................................ 250

Window comparator circuit ................................................................. 254

Zero crossing detection using comparator circuit................................ 257

Sensor Acquisition

Single-supply strain gauge bridge amplifier circuit ............................... 261

Photodiode amplifier circuit ................................................................. 265

Audio

Non-inverting microphone pre-amplifier circuit ..................................... 269

TIA microphone amplifier circuit ........................................................... 274