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Log amplifier

A logarithmic amplifier and logarithmic amplifying technology, which is applied in the directions of amplifiers, amplifier combinations, and parts of amplifying devices, etc., can solve the problems of the large temperature influence of the digital amplifier circuit and the poor performance of the digital amplifier circuit.

Pending Publication Date: 2021-02-12
HANGZHOU CHUNLAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of this, an embodiment of the present invention provides a logarithmic amplifier to solve the problem in the prior art that the logarithmic amplifier circuit is greatly affected by temperature, resulting in poor performance of the logarithmic amplifier circuit

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Embodiment Construction

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation shown in the drawings Or positional relationship is only for the convenience of describing the present application and simplifying...

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Abstract

The invention discloses a logarithmic amplifier which comprises a first sub logarithmic amplification circuit, a second sub logarithmic amplification circuit and a third sub logarithmic amplificationcircuit. The second sub logarithmic amplification circuit comprises a second triode and a second operational amplifier; the third sub logarithmic amplification circuit comprises a third triode, a fourth triode and a third operational amplifier, an emitter of the third triode is connected with an emitter of the second triode, a base and a collector of the third triode are connected with an emitterof the fourth triode, and a base of the fourth triode is grounded; the collector electrode of the fourth triode is connected to one input end of the third operational amplifier, the other input end ofthe third operational amplifier is grounded, and the output end of the third operational amplifier serves as the output end of the logarithm amplification circuit. According to the invention, the problem of poor performance of the logarithm amplification circuit caused by great influence of temperature on the logarithm amplification circuit in the prior art is solved, and the stability of the logarithm amplification circuit is improved.

Description

technical field [0001] The invention relates to the technical field of circuit structures, in particular to a logarithmic amplifier. Background technique [0002] A logarithmic amplifier refers to an amplifying circuit in which the output signal amplitude has a logarithmic function relationship with the input signal amplitude. Mainly converting a signal to its logarithmic equivalent involves a non-linear operational amplifier. [0003] At present, in the conventional flame ionization detector (FID) detection, the signal value collected by the detection end has a very large span, the minimum is pA level, and the maximum can reach mA level. The ordinary flow pressure conversion circuit must pass Switch the gain to adjust the measurement range, there will be disturbance when switching the gain. Based on this, a logarithmic amplifier circuit is proposed. At low frequencies, log amps have wide dynamic range and high dc accuracy. When a small signal is input, the logarithmic a...

Claims

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Application Information

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IPC IPC(8): H03F3/68H03F1/30
CPCH03F3/68H03F1/302
Inventor 陶波管张杰冯雨轩张光光张晶晶邱梦春刘立富付聪于志伟唐怀武
Owner HANGZHOU CHUNLAI TECH