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Op Amps to Suppress Low Frequency Noise

An operational amplifier, low-frequency noise technology, applied in amplifiers, DC-coupled DC amplifiers, differential amplifiers, etc., can solve problems such as inability to meet accurate filtering, improve signal processing accuracy, improve circuit complexity and cost, and improve signal quality. Effect

Active Publication Date: 2020-11-03
HUADA SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the modulation and demodulation frequency of the modulation and demodulation scheme is on the order of kHz, which puts forward high requirements for the low-pass filter. high frequency low frequency noise
However, ordinary low-pass filters cannot meet the requirements of precise filtering.

Method used

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  • Op Amps to Suppress Low Frequency Noise
  • Op Amps to Suppress Low Frequency Noise
  • Op Amps to Suppress Low Frequency Noise

Examples

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Embodiment Construction

[0050] It should be noted that various components in the various figures may be shown exaggerated for illustration purposes and not necessarily to correct scale. In the various figures, identical or functionally identical components are provided with the same reference numerals.

[0051] Unless otherwise specified, in this application, the quantifiers "a" and "an" do not exclude the scene of multiple elements.

[0052] figure 1 A schematic diagram of a first embodiment of an operational amplifier 100 for suppressing low frequency noise according to the present invention is shown.

[0053] like figure 1 As shown, the operational amplifier 100 mainly includes the modulation and demodulation part inside the dotted line box and the sampling and holding part outside the dotted line box.

[0054] The operational amplifier 100 has an input V p , V n , which is used to receive the input signal. The input signal can be, for example, a weak sensor signal. Other signals requiring ...

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Abstract

The invention relates to an operational amplifier for inhibiting the low-frequency noise. The operational amplifier comprises an input for receiving an input signal; a modulator connected with the input end so as to perform the frequency modulation on an input signal by using a modulation signal with modulation frequency of fc; an amplifier component connected with the modulator so as to amplify the modulated input signal; a demodulator for demodulating the amplified signal; a sampling holder for sampling the demodulated signal by selecting a certain time when the signal with the modulation frequency of fc is in a high-level or low-level steady state, wherein the sampling holder is in the holding state when the signal with the modulation frequency of fc is at a rising edge or a falling edge; and an output end for outputting the demodulated signal. The invention further relates to a corresponding amplification circuit and a method for running the operational amplifier. The operational amplifier disclosed by the invention can reduce the circuit cost, and maintain, even improve the signal processing precision at the same time.

Description

technical field [0001] The present invention generally relates to the field of integrated circuits, and in particular to an operational amplifier for suppressing low-frequency noise, an amplifying circuit for suppressing low-frequency noise, and a method for operating an operational amplifier. Background technique [0002] With the development of semiconductor manufacturing technology, the volume and power consumption of chips and circuits are decreasing day by day, and the electrical signals in these chips and circuits are also getting weaker and weaker. In addition, in many cutting-edge technical fields such as aerospace, human biological signal processing, and weak signal detection, the requirements for signal accuracy are getting higher and higher. All of these put forward higher requirements on the accuracy of signal processing (such as analog-to-digital conversion). [0003] An important component used in signal processing is the operational amplifier. The ability of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F1/14H03F3/45
CPCH03F1/14H03F1/26H03F3/45179H03F2200/348
Inventor 于玮玮林鸿鹏刘松王永流
Owner HUADA SEMICON CO LTD
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