Amplifiers

Amplifier design challenges

And the solutions to help you solve them

Whether you’re challenged with solving ambient temperature monitoring, low-side current sensing, or signal filtering issues, utilize our resources to solve your specific amplifier design challenges. Choose from industry leading reference designs, key applications notes, white papers, video content and more.

Ambient temperature monitoring

Ambient temperature monitoring is critical in many applications to control environmental conditions or ensure safe operating conditions. Our broad portfolio of amplifiers, available in standard and compact packages, enables accurate measurements from a variety of temperature sensors.

Key benefits:
 
  • Use the whole dynamic range of the ADC: Amplifiers can be used to condition temperature sensor signals to utilize the full ADC resolution and increase measurement accuracy. TI has a wide range of RRIO op amps available to help maximize use of your ADC.

  • Improve settling time: Amplifiers can be used to buffer the temperature sensor signal  and drive the ADC’s input to achieve the proper settling and desired accuracy. Our wide portfolio of amplifier bandwidth options allows designers to select an amplifier that meets their needs.

  • Save power: We offer many shutdown op amps that can be powered down in between temperature measurements to lower overall system power consumption.

  • Save space: We offer op amps that can fit in a 0.64mm2 area, helping reduce overall solution size.
diagram

Ambient temperature monitoring

diagram

Ambient temperature monitoring with NTC

Device
Device description
Design resources
TLV9061 World’s smallest amplifier (0.8 x 0.8mm  single channel, 2 x 2mm dual channel, 2 x 2mm quad channel). Fully RRIO with 1.8V to 5.5V operation, 10MHz gain-bandwidth, 50mA output current, and shutdown options. Application report:
Buffer circuit
TLV9062
Dual, 10-Mhz, low-noise RRIO operational amplifier.

Application report:
Temperature sensing with NTC circuit

Temperature sensing with PTC circuit

TLV9002 Dual, operational amplifier with rail-to-rail output swing capabilities available in micro-sized and industry standard packages. Application report: 
Non-inverting amplifier circuit

Reference design:
TIPD2096: Single-supply thermocouple amplifier with RTD based cold junction compensation

Low-side current sensing

Measuring the voltage drop of a shunt resistor place between a load and ground is useful for monitoring and protecting circuit elements, as well as understanding the phase and position of multiphase motors. We offer a comprehensive list of low voltage amplifiers that are optimal for measuring low-side currents.

Key benefits:

  • Determine phase and position of motors: Amplifiers can be used to sense low side currents of multiphase motors in order to determine the motor’s position. Our high slew rate op-amps are useful for sensing fast transients through motor windings. 

  • System level monitoring: Amplifiers can be used to sense the current delivered to a load and detect an over current condition. These options allow you to monitor system performance and maintain proper operating conditions.

  • Small size: We offer many small op amp package options, including the industry's smallest SON package, needed in space constrained layouts.
Opamp low side current sensing block diagram

Low-side current sensing

Device
Device description
Design resources
TLV9052 5MHz, 15V/us high slew-rate, RRIO op amp.

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

Low voltage, high slew rate op-amps for motor drive circuits

OPA2325 Precision, 10-MHz, low-noise, low-power, RRIO, CMOS zero-crossover operational amplifier. Technical article:
Low-side current sensing for high-performance cost-sensitive applications
TLV9062 10-MHz, low-noise, RRIO, CMOS operational amplifier for cost-sensitive systems.

Reference design:
TIPD129: 0-1A, single supply, low-side, current sensing solution

Application report:
Low-side, bidirectional current sensing circuit

Signal filtering

Excessive noise, which can appear as a measurement error in sensor systems or an unwanted hiss or popping sound through a speaker in audio systems, is problematic in many designs. Reducing the total noise by filtering the input signal increases the accuracy and performance of a system. We have an extensive portfolio of  low noise, high bandwidth, and small size amplifiers to meet the need of any filter design in order to optimize system performance.

Key benefits:

  • Reduce total noise: We offer a wide portfolio of low noise amplifiers that provide the flexibility needed to design any filter topology and satisfy a system’s total noise requirement.

  • High bandwidth options: Active filter topologies often require high bandwidth amplifiers to reduce undesired effects caused by an amplifier’s open loop output impedance. Our extensive family of wide bandwidth amplifiers provides designers with many options to meet the demand of their filter design.

  • Save space: We offer op amps that can fit in a 0.64mm2 area, helping reduce overall solution size.
 Signal filtering (C1)

Signal filtering (C1)

diagram

Signal filtering (C2)

Device
Device description
Design resources
TLV6741 10-MHz, low-power, low noise, RRO, operational amplifier.
Application report:
Low-pass filtered, inverting amplifier circuit
OPA172 36-V, single supply, 10-MHz, rail-to-rail output operational amplifier. Application report:
Band pass filtered inverting attenuator circuit
OPA828 36-V, high-precision, low-noise, low bias current, JFET-input 45 MHz operation  amplifier. Filter Design Tool