Phase-locked amplifier for detecting weak photo-current signals

A lock-in amplifier and current signal technology, applied in the electronic field, can solve the problems of expensive, difficult-to-portable instruments, and large volume, and achieve the effects of low cost, wide frequency response range, and simple circuit structure

Pending Publication Date: 2017-09-01
ANKANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although these commercial products have superior performance, they are bulky and expensive, making them difficult to apply to portable instruments

Method used

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  • Phase-locked amplifier for detecting weak photo-current signals
  • Phase-locked amplifier for detecting weak photo-current signals
  • Phase-locked amplifier for detecting weak photo-current signals

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Embodiment Construction

[0036] The present invention will be described in further detail and completely below in conjunction with the embodiments and accompanying drawings.

[0037] The lock-in amplifier is a synchronous correlation detector designed by using the principle of cross-correlation. Using the cross-correlation characteristics of the reference signal and the measured signal, the signal with the same frequency and phase as the reference signal is extracted from the measured signal. Lock-in amplifiers can be divided into analog lock-in amplifiers and digital lock-in amplifiers. According to the number of phase-sensitive detectors in lock-in amplifiers, they can also be divided into single-phase lock-in amplifiers and dual-phase lock-in amplifiers. The analog lock-in amplifier has the advantages of simple circuit structure and fast response speed. In addition, considering cost reduction, an analog single-phase lock-in amplifier is adopted in the present invention, such as figure 2 As shown ...

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PUM

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Abstract

The invention provides a phase-locked amplifier for detecting weak photo-current signals. The phase-locked amplifier comprises a signal channel, a reference channel and a phase-sensitive detector, and further comprises a low-pass filter; the signal channel comprises an I / V conversion circuit, a three-stage amplification circuit and an alternating-current coupler; and the I / V conversion circuit, the three-stage amplification circuit and the alternating-current coupler are connected in sequence. The phase-locked amplifier provided by the invention has the advantages that: detection of the weak photo-current signals is realized; and the phase-locked amplifier provided by the invention is wide in detectable input current range, wide in frequency response range bandwidth, good in linearity, low in cost, simple in circuit structure and relatively high in use value.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a lock-in amplifier for detecting weak photocurrent signals. Background technique [0002] Since Hafeman and others introduced the surface photovoltage measurement technology into the electrolyte / insulator / semiconductor (electrolyte / insulator / semiconductor, referred to as EIS) structure in 1988, they first proposed the concept of Light-Addressable Potentiometric Sensor (LAPS). . Since LAPS is addressed by beam scanning instead of fixed electrode leads or other complex external circuit structures, only one lead can be used to measure multiple points, and the stability is good and the detection time is short. ; So as to meet the requirements of miniaturization, intelligence and multi-function of chemical sensors. Therefore, LAPS has been widely used to measure pH value, oxidation-reduction potential, ion concentration, research on electrical characteristics of biofilm, detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/093H03F1/26H03F1/42
CPCH03F1/26H03F1/42H03L7/093H03F2200/36H03F2200/372
Inventor 崔智军王磊阎丽平
Owner ANKANG UNIV
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