DESIGN OF LOW NOISE AMPLIFIER FOR SEISMIC SIGNALS

Abstract

This paper presents a comparative study of
different existing Low Noise Amplifier (LNA) for Low
frequency sensor ap-plication. The focus of this
paper is on conditioning low frequency sensor signal
like for biomedical signal acquisition, seismic wave
alertness system etc, the design is more concentrated
on some applications like seismic detection, where
unpredictability and unknown nature of seismic
signal is a concerned factor.
Typical single frequency LNA is required to
operate with low noise, high gain and good linearity
at 2.4 GHz. The design adopts feedback, and
balanced topology to counter the problem of
conventional LNA design which has difficulty in
meeting the design specification
The Differential Difference Amplifier(DDA)
architecture discussed here may be suitable for micro
power sensor interface in scaled CMOS Technology.
.Index terms— Analog Front-end (AFE), Sensors,
Amplifier Noise, CMOS Amplifier, Noise Efficiency
Factor (NEF).