Analog circuits

Analog circuits are combined together to create sub-systems of complete designs

Learn how to simplify and speed system design with our comprehensive library of sub-circuit ideas. Our analog engineer’s circuit cookbooks offer 60+ amplifier and 40+ data converter sub-circuit designs in two easy to use e-books. Each circuit can be easily adapted to meet your specific end equipment needs and includes step-by-step instructions, basic formulas, schematic diagrams and SPICE simulations.

Amplifier circuits

Each circuit below is presented as a "definition-by-example" and includes step-by-step instructions with formulas enabling you to adapt the circuit to meet your design goals. These circuits require a basic understanding of amplifier concepts. If you're new to amplifier design, we highly recommend completing our TI Precision Labs (TIPL) training series.

Basic circuits

Buffer (follower) circuit

Inverting amplifier circuit

Non-inverting amplifier circuit

Inverting summer circuit

Difference amplifier (subtractor) circuit

Two op amp instrumentation amplifier circuit

Three op amp instrumentation amplifier circuit

Integrator circuit

Differentiator circuit

Current sensing

Transimpedance amplifier circuit

Single-supply, low-side, unidirectional current sensing solution with output swing to GND circuit

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

Low-side, bidirectional current sensing solution circuit

High-side, bidirectional current sensing circuit with transient protection

High-side current-sensing circuit design

3-decade load current sensing circuit

High voltage, high-side floating current sensing circuit using current output current sense amplifier

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

Overcurrent event detection circuit

Bidirectional current sensing with a window comparator circuit

Adjustable-gain, current-output, high-side current sensing circuit

Precision overcurrent latch circuit

Fast-response overcurrent event detection circuit

Low (microamp), high-side, current-sensing circuit with current-sensing amplifier at high voltage and overtemperature

Transimpedance amplifier with T-network circuit

AC-coupled transimpedance amplifier circuit

Signal sources

PWM generator circuit

Adjustable reference voltage circuit

Sine wave oscillator circuit

Current sources

Low-level voltage-to-current converter circuit

"Improved” Howland current pump circuit

"Improved" Howland current pump with buffer circuit

High-side V-I with BJT circuit

High-side V-I with Darlington pair circuit

High-side V-I with MOSFET circuit

Filters

AC coupled (HPF) inverting amplifier circuit

AC coupled (HPF) non-inverting amplifier circuit

Band pass filtered inverting attenuator circuit

Fast-settling low-pass filter circuit

Low-pass filtered, inverting amplifier circuit

High-pass Sallen-Key filter circuit

Low-pass Sallen-Key filter circuit

Multiple feedback band-pass filter circuit

Band-pass Sallen-Key filter circuit

Multiple feedback high-pass filter circuit

Multiple feedback low-pass filter circuit

Low-pass filtered non-inverting amplifier circuit

Non-linear circuits (rectifiers/clamps/peak detectors)

Half-wave rectifier circuit

Full-wave rectifier circuit

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

Slew rate limiter circuit

Single-supply, high-input voltage, full-wave rectifier circuit

Signal conditioning

Single-ended input to differential output circuit

Inverting op amp with inverting positive reference voltage circuit

Non-inverting op Amp with inverting positive reference voltage circuit

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

Inverting op amp with non-inverting positive reference voltage circuit

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

Inverting dual-supply to single-supply amplifier circuit

Dual-supply, discrete, programmable gain amplifier circuit

AC coupled instrumentation amplifier circuit

Discrete wide bandwidth INA circuit

Differential input to differential output circuit using a fully-differential amplifier

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

Inverting amplifier with T-network feedback circuit

Inverting attenuator circuit

Low-pass, filtered, non-inverting amplifier circuit

Comparators

Signal and clock restoration circuit

Comparator circuit with and without hysteresis

High-side current sensing with comparator circuit

High-speed overcurrent detection circuit

Inverting comparator with hysteresis circuit

Low-power, bidirectional current sensing circuit

Non-inverting comparator with hysteresis circuit

Overvoltage protection with comparator circuit

Window comparator with integrated reference circuit

Relaxation oscillator circuit

Thermal switch circuit

Undervoltage protection with comparator circuit

Window comparator circuit

Zero crossing detection using comparator circuit

ORing MOSFET controller with comparator circuit

LVDS data and clock recovery circuit with high-speed comparators

LiDAR receiver comparator circuit

LVDS GaN driver transmitter circuit with high-speed comparator

Sensor acquisition

Single-supply strain gauge bridge amplifier circuit

Photodiode Amplifier Circuit

Low-noise and long-range PIR sensor conditioner circuit

Temperature sensing with NTC circuit

Temperature sensing with PTC circuit

Audio

Non-inverting microphone pre-amplifier circuit

TIA microphone amplifier circuit

Integrated amplifier circuits using MSP430™ microcontrollers

Single-supply, low-side, unidirectional current-sensing circuit with MSP430™ smart analog combo

Temperature sensing NTC circuit with MSP430™ smart analog combo

Temperature sensing PTC circuit with MSP430™ smart analog combo

Low-noise and long-range PIR sensor conditioner circuit with MSP430™ smart analog combo

High-side current-sensing circuit design with MSP430™ smart analog combo

Single-supply strain gauge bridge amplifier circuit with MSP430™ smart analog combo

Low-side bidirectional current sensing circuit with MSP430™ smart analog combo

Half-wave rectifier circuit with MSP430™ smart analog combo

Transimpedance amplifier circuit with MSP430™ smart analog combo

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Data converter circuits

Each data converter circuit below includes step-by-step instructions with formulas allowing you to adapt the circuit to meet your unique design requirements. We've provided at least one recommended data converter for each circuit, but you can easily swap it with another device if you've found one that fits better with your design. Our circuits require a basic understanding of data converter concepts, so if you are new to data converter design, we highly recommend reviewing our TI Precision Labs (TIPL) training series.

Analog-to-digital converter (ADC) circuits

Low-power, small size, and cost optimized circuits

Driving SAR directly without a front-end buffer circuit (low power, low sampling speed DAQ)

Low-power sensor measurements: 3.3 V, 1 ksps, 12-bit single-ended, dual supply circuit

Low-power sensor measurements: 3.3 V, 1ksps, 12-bit single-ended, single supply 12-bit, single-ended, single-supply circuit

Level translation input drive circuits

Circuit for driving a high-voltage SAR with an instrumentation amplifier

Circuit for driving high-voltage SAR ADC with a buffered instrumentation amplifier

Circuit for driving high-voltage SAR ADCs for high-voltage, true differential signal acquisition

Circuit to increase input range on an integrated analog front end (AFE) SAR ADC

High common-mode differential input voltage to ±10-V ADC input circuit

High-current battery monitor circuit: 0-10 A, 0-10 kHz, 18-bit

High-input impedance, true differential, analog front end (AFE) attenuator circuit for SAR ADCs

High voltage battery monitor circuit: ±20 V, 0-10 kHz, 18-bit fully differential

Single-Ended to differential signal conversion using an op amp and FDA for unipolar signals

Single-ended to differential circuit using an op amp and fully differential amplifier (FDA) for bipolar signals

Single-ended to differential using a two op-amp circuit

True differential, 4 × 2 MUX, analog front end, simultaneous-sampling ADC circuit

Circuit for detecting input floating on ADS8681 ADC

Low-level sensor input circuits

Circuit for driving a switched-capacitor SAR ADC with an instrumentation amplifier

Circuit for driving a switched-capacitor SAR ADC with a buffered instrumentation amplifier

Circuit for driving an ADC with an instrumentation amplifier in high gain

Low-input bias-current front end SAR ADC circuit

High-side current shunt monitor circuit to 3-V single-ended ADC

Two-wire PT100 RTD measurement circuit with low-side reference

Three-wire PT100 RTD measurement circuit with high-side reference and two IDAC current sources

Three-wire PT100 RTD measurement circuit with low-side reference and one IDAC current source

Three-wire PT100 RTD measurement circuit with low-side reference and two IDAC current sources

Four-wire PT100 RTD measurement circuit with low-side reference

Two-channel, K-type thermocouple measurement circuit with internal temperature sensor CJC

Input protection, filtering and isolation circuits

±12-V voltage sensing circuit with an isolated amplifier and pseudo-differential input SAR ADC

±12-V voltage sensing circuit with an isolated amplifier and differential input SAR ADC

Anti-aliasing filter circuit design for single-ended ADC input using fixed cutoff frequency

Circuit showing overstress protection on ADC with integrated analog front end

Digitally-isolated ADS8689 circuit design

Reducing effects of external RC filter circuit on gain and drift error for integrated analog front ends (AFEs): ±10 V

Circuit for protecting low-voltage SAR ADC from electrical overstress with minimal impact on performance

Input protection for high-voltage ADC circuit with TVS diode

Circuit for protecting ADC with TVS diode and PTC fuse

Circuit for protecting ADS131M0x ADC from EOS

Commonly used auxiliary circuits

Isolated power supply, low-noise circuit: 5 V, 100 mA

Powering a dual-supply op amp circuit with one LDO

Digital-to-analog converter (DAC) circuits

Audio outputs

Active-filtering circuit for audio DAC

Auxiliary circuits for high-performance audio

Current-to-voltage converter circuit for audio DACs

Auxiliary and biasing circuits

Circuit for offset adjustment of input signals using precision DAC formeasurement equipment

DAC force and sense reference drive circuit

Power-supply margining circuit for LDOs using a precision DAC

Power-supply margining circuit for SMPS using a precision DAC

Current sources

Loop-powered 4- to 20-mA transmitter circuit

Programmable low-side current sink circuit

Programmable, two-stage, high-side current source circuit

Voltage sources

Circuit for differential output from a single-ended precision DAC

High-current voltage output circuit using a precision DAC

Progammable voltage output with sense connections circuit

Unipolar negative voltage source from unipolar DAC circuit

Unipolar voltage output DAC to bipolar voltage output circuit

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Analog circuits

Analog Engineer’s Circuit Cookbook: Amplifiers

The Analog Engineer’s Circuit Cookbook: Amplifiers provides amplifier subcircuit ideas that you can quickly adapt to meet your specific system needs. Each circuit is presented as a “definition by example.”

View e-book

Analog Engineer’s Circuit Cookbook: Data Converters

The Analog Engineer’s Circuit Cookbook: Data Converters provides analog-to-digital converter (ADC) and digital-to-analog converter (DAC) sub-circuit ideas that can be quickly adapted to meet your specific system needs.

View e-book

Learn more about Arm® Cortex ®-M0+ MCUs subsystems

Subsystems

Arm® Cortex ®-M0+ MCUs subsystems

Accelerate your development with our broad selection of MSPM0 subsystems ideas. Integrate these application building blocks to simplify your software effort.