Low Noise Voltage Amplifier for Quartz and High Impedance Sensors

Abstract

The paper describes a circuit implementation of a low-noise voltage amplifier with a low equivalent noise level in a wide frequency band, a low input capacitance, and a high gain. An analysis of the existing problems of implementation is given, a circuit solution is proposed based on the use of modern components and the possibility of varying the parameters of the amplifier for the given operating conditions. The main advantage of the amplifier is the modular design principle, which allows the gain, input capacitance, equivalent noise level and bandwidth to be varied without changing the design for the required conditions of use. This is achieved through a rational combination of discrete and integral components. The high gain is combined with a small linear design that allows it to be placed in close proximity to the sensor. The developed amplifier can find application in experimental technology and medical equipment.