High-frequency wideband amplification circuit used for piezoresistive dynamic pressure sensor

Abstract

A high frequency broadband amplifier used for piezoresistive dynamic pressure sensor, connected between outlet line of dynamic pressure sensor, including two-stage amplifiers, power filter circuit and signal filter circuit, the first-class amplifier was composed of the instrument amplifier, its input and negative feedback ends connect the two differential output end of the sensor; the second-class amplifier was composed of high-speed operational amplifier, its input end connect the output end of the instrument amplifier; the power filter circuit were positive or negative, individually parallel connect two electrolytic capacitors or two ceramic capacitors with the earth; the signal filter circuit was self-made band-pass filter consisted by three Y connected inductions, one induction concatenate the high-frequency ceramic capacitor, then connect with the outlet end of the operational amplifier, the other one parallel connect the high-frequency ceramic capacitor, then connect the earth; the last one was took as the outlet end of the amplifier after first connected in series the high-frequency ceramic capacitor. This invention is of high frequency, low noise, with fast rise speed, and anti-interference.

Description

technical field [0001] The invention relates to a high-frequency and wide-band amplifying circuit, in particular to a high-frequency and wide-band amplifying circuit for a piezoresistive dynamic pressure sensor, which is applied to military engineering, blasting test and shock wave measurement. Background technique [0002] The main methods currently applied to high-frequency measurement of broadband amplifiers are: [0003] 1) Directly use a high-speed operational amplifier: Although this method has good high-frequency characteristics, due to the poor ability of the operational amplifier to suppress noise signals, when amplifying the signal, the noise will be amplified at the same time and affect the output. [0004] 2) Direct use of high-speed instrumentation amplifiers: Although this method has low noise characteristics, the voltage rise rate due to its basic characteristics is much slower than that of operational amplifiers, and its high-frequency characteristics will be...

AI Technical Summary

Problems solved by technology

[0003] 1) Directly use a high-speed operational amplifier: Although this method has good high-frequency characteristics, due to the poor ability of the operational amplifier to suppress noise signals, the noise will be amplified at the same time and affect the output when the signal is amplified.

[0004] 2) Direct use of high-speed instrumentation amplifiers: Although this method has low noise characteristics, the voltage rise rate due to its basic characteristics is much slower than that of operational amplifiers, and its high-frequency characteristics will be greatly reduced as the magnification increases.

Images