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Digital phase locking amplifier and digital phase locking control method

A digital phase-locking and amplifier technology, applied in amplifiers, parametric amplifiers, amplifier types, etc., can solve the problems of long time to complete the calculation, large amount of calculation, limiting the speed of digital phase-locking detection and the frequency of the detected signal, etc. Achieve the effect of fast calculation speed, high precision measurement and easy debugging

Active Publication Date: 2012-01-25
TIANJIN UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a digital lock-in amplifier and a digital lock-in control method. For the speed of phase-lock detection and the frequency of the detected signal, please refer to the following description for details:

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  • Digital phase locking amplifier and digital phase locking control method
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  • Digital phase locking amplifier and digital phase locking control method

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] Suppose the signal to be detected is x a (t)=Asin(2πf 0 t+θ), where A is the amplitude of the signal, f 0 is the frequency of the signal, and θ is the initial phase angle. According to the sampling frequency f s =M×f 0 For sampling, M≥2. The number of sampling periods is N, the total number of sampling points Q=M×N, and the obtained sampling signal x(k) is:

[0032] x(k)=Asin(2πk / M+θ) k=0, 1, 2,..., Q-1 (1)

[0033] In digital phase-locking, the reference sequence is generated by the microprocessor 3 according to M, and the orthogonal reference sequence y S (k) and y C (k) are respectively:

[0034] the y S (k)=sin(2πk / M) k=0, 1, 2,..., Q-1 (2)

[0035] the y C (k)=cos(2πk / M) k=0, 1, 2,..., Q-1 (3)

[0036] The coll...

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Abstract

The invention discloses a digital phase locking amplifier and a digital phase locking control method. The digital phase locking amplifier comprises a pre-amplifier and a micro-processor. The pre-amplifier is used for amplifying a tested analogue signal, inputting the tested analogue signal into an analogue-digital converter, converting the amplified tested analogue signal into a digital signal, and inputting the digital signal into the micro-processor through a Px interface. The micro-processor is used for controlling the gain of the pre-amplifier through a Py interface according to the amplitude of the digital signal, processing the digital signal, detecting the digital signal with the pre-set frequency in the digital signal, and outputting the digital signal with the pre-set frequency through a Pz interface. The control method comprises the following steps: the micro-processor controls the analogue-digital converter to sample the tested analogue signal according to the speed which is 4M times of that of the pre-set frequency F0, represented in the equation of fs=4M*f0, so as to obtain a sampling signal; the micro-processor downwardly samples the sampling frequency fs=4M*f0 to 4*f0; two orthogonal components RS and RC of the tested analogue signal are calculated according to the sampling signal; and the amplitude A and the phase angle of the tested analogue signal can be obtained by calculation.

Description

technical field [0001] The invention relates to a digital lock-in amplifier and a digital lock-in control method. Background technique [0002] Single-frequency signal detection is the most common signal detection requirement, and it is widely used in various measuring instruments and measurement and control systems. Now commonly used is an analog lock-in amplifier (also known as a lock-in detection circuit). This analog lock-in detection method has a series of disadvantages, such as complex circuits, high process requirements, and serious drift. [0003] Compared with analog lock-in amplifiers, digital lock-in amplifiers can avoid various disadvantages of analog circuits. The invention patent "A Digital Lock-in Amplifier" (public number: CN101060311, public date: October 24, 2007) proposed by Wang Zixin and others uses a digital circuit to provide a reference signal, which significantly improves the anti-interference performance of the circuit. [0004] The inventor finds...

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Application Information

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IPC IPC(8): H03F7/00H03L7/00
Inventor 李刚刘近贞郝丽玲周梅林凌
Owner TIANJIN UNIV
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