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[FAQ] [H] Frequently Asked Questions - High Speed Amplifiers Selection Guide - Bipolar Input Amplifiers

Leaphar Castro
Prodigy 170 points

Frequently Asked Questions: Amplifiers >> High Speed Amplifiers >> HSA Selection Guide >> Bipolar Input Selection Guide

JFET Input

Bipolar Input

CMOS Input

FDAs

Power Amps

VGAs

TIAs

Introduction: 

  • Bipolar-input amplifiers offer lower voltage noise, higher precision, lower power consumption for a similar bandwidth as a FET/CMOS op amp.

Applications: 

Oscilloscope & Digitizers

Active Probe

Benchtop Digital Multimeter(DMM)

LCR Meter & Impedance Analyzer

 Data Acquisition (DAQ)

Power Analyzer

 Semiconductor Test & ATE

Vibration monitoring

Fish Finders

Semiconductor Manufacturing

Medical Ultrasound

 In-vitro diagnostics

MRI

 Electrosurgery

Fetal Monitoring

Metal Detectors

Filter Designs

  • A list of TI publications related to high speed amplifiers and their applications can be found here: Application Notes  

Recommended High Precision Device Table: 

Devices Supply Voltage (V) GBW (MHz) Iq (mA) Voltage Offset (uV)(max) Offset Drift (uV/C) (typ)
OPA863A/OPA2863A 2.7 to 12.6 50 0.8 95 0.3
OPA625/ OPA2625 2.7 to 5.5 120 2 100 0.5
OPA838 (decomp) 2.7 to 5.4 300 0.96 125 0.4
OPA836 2.5 to 5.5 118 1 400 1.1

Recommended Low Noise Device Table: 

Devices Supply Voltage (V) GBW (MHz)(min V/V) Iq (mA) Voltage Noise (nV√Hz) Current Noise (pA√Hz)
OPA847 10 to 12 3900 (12) 18.1 0.85 2.5
OPA856 3.3 to 5.5 1080 (1) 17.2 0.9 2.5
OPA891/ OPA2891 9 to 36 180 (1) 7.5 0.95 2.3
OPA892/OPA2892 9 to 36  2000 (10) 7.5 0.95 2.3
OPA855 3.3 to 5.5 8000(7) 17.8 0.98 2.5
OPA211/OPA2211A 4.5 to 36 80 (1) 3.6 1.1 1.7
OPA838  2.7 to 5.4 300 (6) 0.96 1.7 1

Recommended Low Power Device Table: 

Devices Supply Voltage (V) GBW (MHz) Iq (mA) Shutdown Iq (uA) Rail to Rail
OPA2834 2.7 to 5.4 20 0.17 NA In to V-, Out
OPA835/OPA2835 2.5 to 5.5 30 0.25 0.5 In to V-, Out
OPA863A/OPA2863A 2.7 to 12.6 50 0.8 11 In, Out
OPA838 (decomp) 2.7 to 5.4 300 0.96 0.1 In to V-, Out
OPA836/OPA2836 2.7 to 5.4 118 1 0.5 In to V-, Out

Recommended Automotive Qualified Device Table: 

Devices Supply Voltage (V) GBW (MHz) Iq (mA) Voltage Offset (mV)(max) Offset Drift (uV/C) (typ)
OPA2863-Q1 2.7 to 12.6 50 0.8 0.095 0.3
LMH6642Q-Q1 2.7 to 10 57 2.7 5 5
LMH6619-Q1 2.7 to 11 63 1.45 0.75 0.9
OPA2836-Q1 2.5 to 5.5 118 1 400 1.1