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[FAQ] [H] Frequently Asked Questions - High Speed Amplifiers Selection Guide - Variable Gain Amplifiers

Frequently Asked Questions: Amplifiers >> High Speed Amplifiers >> HSA Selection Guide >> Variable Gain Amplifier Selection Guide

JFET Input

Bipolar Input

CMOS Input

FDAS

Power Amps

VGAs

TIAs

Introduction: 

  • Variable gain amplifiers (VGAs) that can change its gain based on a control voltage. Also known as voltage controlled amplifiers (VCA ) or digitally controlled VGA (DVGA) where analog voltages control the gain of the amplifier. 

Applications: 

Oscilloscope & Digitizers

Flow Transmitter

Semiconductor Test & ATE

Semiconductor Manufacturing Network Analyzer  Biochemistry Analyzer

In-vitro diagnostics

Medical Ultrasound

MRI

Wireless Communications

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

Recommend VGAs Table: 

Devices BW (MHz) Iq (mA) Voltage Noise (nV/√Hz) Gain Range (dB) Gain Accuracy (dB) (typ)
VCA810 (Diff to Diff) 30 24.8 2.4 -40 to +40 0.5dB
THS7001 (Diff to SE) 70 5.5 1.7 -20 to 20 +-7.5%
LMH6505 (Diff to SE) 150 11 4.4 set externally 80dB --
THS7530 (Diff to Diff) 300 40 1.1 +11.6 to +46.5 4
LMH6518 900 210 0.98 -1 to +40 0.75dB

Recommended GHz VGAs Table: 

Devices BW (GHz) Iq (mA) Noise Figure (dB) Gain Range (dB) Gain Step size(dB)
LMH6401 4.5 69 8 -6 to +26 1
LMH6881 2.4 50 9.7 6 to +26 0.25

Recommended Automotive Qualified VGA Table: 

Devices BW (MHz) Iq (mA) Voltage Noise (nV/√Hz) Gain Range (dB) Gain Accuracy (dB) (typ)
THS7530-Q1 (Diff to Diff) 300 40 1.1 +11.6 to +46.5 4