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Sine and cosine signal amplitude calculation circuit with double-sampling structure

A technique for calculating circuit and signal amplitudes, applied in the physical field, can solve problems such as the inability to eliminate the input offset of operational amplifiers, large random mismatches of transistors, etc., and achieve the effects of eliminating random mismatches, low transistor mismatches, and accurate output voltage values

Active Publication Date: 2021-08-27
XIDIAN UNIV
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  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and propose a sine-cosine signal amplitude calculation circuit with a double-sampling structure, which is used to solve the large random mismatch of transistors in the amplitude calculation circuit existing in the prior art, which cannot be eliminated. Op Amp Input Offset Problems

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  • Sine and cosine signal amplitude calculation circuit with double-sampling structure
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  • Sine and cosine signal amplitude calculation circuit with double-sampling structure

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Embodiment Construction

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Refer to the attachment figure 1 Further detailed description of the integral circuit of the present invention.

[0018] The present invention includes a sampling unit, a square count unit, a summation and calculation unit. The sampling unit includes two configurations of the same first dual sampling unit 1 and the second dual sampling unit 2. The square computing unit includes two structural first square calculating units 1, and the second square calculation unit 2. The first to fourth input terminals of the first dual sampling unit 1 respectively correspond to the bias current I B1 I B2 , Sinusoidal DC voltage V DC , Sinusoidal voltage signal V SIN Connection, output terminal i SIN Connect to the first input of the first square calculation unit 1. The first to fourth input terminals of the second dual sampling unit 2 respectively correspond to the bias current I B1 ...

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Abstract

The invention discloses a sine and cosine signal amplitude calculation circuit with a double-sampling structure. The sine and cosine signal amplitude calculation circuit comprises a sampling unit, a square calculation unit and a summation calculation unit. The sampling unit converts input sine and cosine voltage signals into sine and cosine current signals, and input imbalance of the operational amplifier is eliminated through sampling. And the square calculation unit performs square operation on the sine and cosine current signals and then sums the sine and cosine current signals by using the summation calculation unit, and finally outputs a voltage signal which is in a linear relation with the square of the amplitude of the signal. In the whole amplitude calculation process, each unit carries out sampling and holding on the same transistor, and random mismatch of the device is eliminated. On the premise that sine and cosine signal amplitude information is extracted, the problems that random mismatch of transistors in an existing amplitude calculation circuit is large, and operational amplifier input imbalance cannot be eliminated are solved.

Description

Technical field [0001] The present invention belongs to the field of physical technology, and more is a further involve a positive cosine signal amplitude calculation circuit having a dual sampling structure in the field of integrated circuit technology. The present invention calculates the positive cosine signal amplitude by calculating the positive cosine signal amplitude using the sampling unit, the square calculation unit, the evaluation and calculation unit, and can be used in an amplitude information extraction of the positive cosine voltage signal in the integrated circuit angle sensor. Background technique [0002] The positive cosine signal amplitude computing circuit is a key module that implements the angular information extraction in the integrated circuit angle sensor. Its function is to calculate the amplitude of the positive cosine voltage signal when the angle sensor magnet is rotated, and convenient for other modules to extract angle information to determine Roto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/30
CPCG01B7/30
Inventor 袁冰应晶袁昕查子健霍艳丽
Owner XIDIAN UNIV
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