Differences of low noise amplifier(LNA) and instrumentation amplifier(INA)

Status
Not open for further replies.
T

tendo R

Newbie level 4
Joined
Dec 5, 2014
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Location
欧本, United States
Activity points
54
Is there a clear definition difference between these two amplifiers? I know input impedance of INA is large and usually do not need matching but why can't it be low noise? Does impedance matching helping LNA achieve low noise effect? Can LNA be used for low frequency (below 100Hz) high impedance(10kΩ) sensors?
 

Those are two amplifiers that are not related other than they are both amplifiers.

LNA means the amplifier is specifically designed for low noise. It's other characteristics are not defined by that designation and they generally aren't differential.
Impedance matching can help improve the signal to noise ratio since it helps couple the maximum signal to the LNA input.

An INA is an amplifier with a high-impedance differential-input and and a fixed gain. Noise can be low or not but likely not as low as an LNA.

To determine which will work best in a particular application depends upon the application requirements.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…