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Low-noise amplification circuit

A low-noise amplification and circuit technology, which is applied in the direction of improving the amplifier to reduce the impact of noise, can solve the problems of affecting the performance of the low-noise amplifier, deteriorating the performance of the system receiver, and serious substrate coupling noise, etc., to achieve small noise mismatch, eliminate Miller effect, wide range of effects

Inactive Publication Date: 2013-12-18
KUNSHAN AODELU AUTOMATION TECH
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0003] With the improvement of circuit integration, substrate coupling noise becomes more and more serious. Single-ended amplifiers have no ability to suppress substrate coupling. Substrate coupling will greatly affect the performance of low-noise amplifiers, and ultimately greatly deteriorate the system receiver. performance, the traditional single-ended input and output low-noise amplifier cannot solve the mismatch problem between gain, amplitude and phase in the output signal well, the noise mismatch is serious, and the power consumption is large

Method used

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Embodiment Construction

[0015] Such as figure 1 As shown, the present invention includes a triode, a field effect transistor, a resistor and a capacitor. The collector of the triode Q1 is connected to a positive voltage through the third capacitor C3, and the triode Q1 transmits the current to the drain of the second field effect transistor Q2 and the second field effect transistor Q2 respectively. The drain of the three field effect transistors Q3, the collector of the triode Q1 is connected to the base through the fifth resistor R5, the base is grounded through the sixth resistor R6, and the fourth capacitor C4 is connected in parallel to both ends of the sixth resistor R6; The gates of the three field effect transistors Q3 are connected to the gates of the second field effect transistor Q2 through the first capacitor C1, and the gates of the second field effect transistor Q2 and the source electrodes of the third field effect transistor Q3 are respectively grounded through a resistor, The drain of...

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Abstract

The invention discloses a low-noise amplification circuit, which comprises a triode, field effect tubes, resistors and capacitors. According to the low-noise amplification circuit, the junction field effect tubes which are low in noise and wide in application range, and are capable of being matched with high-internal-resistance signal sources are adopted, and the triode is adopted for forming a follower, so that the Miller effect is avoided, the upper limiting frequency is improved, and lower noise mismatch is realized.

Description

[0001] technical field [0002] The invention relates to an amplifying circuit, in particular to a low-noise amplifying circuit. Background technique [0003] With the improvement of circuit integration, substrate coupling noise becomes more and more serious. Single-ended amplifiers have no ability to suppress substrate coupling. Substrate coupling will greatly affect the performance of low-noise amplifiers, and ultimately greatly deteriorate the system receiver. The traditional single-ended input and output low-noise amplifiers cannot solve the mismatch problem between gain, amplitude and phase in the output signal well, the noise mismatch is serious, and the power consumption is large. [0004] Therefore, a new technical solution is needed to solve the above problems. Contents of the invention [0005] Purpose of the invention: In view of the above-mentioned existing problems and deficiencies, the purpose of the present invention is to provide a low-noise amplifier circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26
Inventor 郁彬
Owner KUNSHAN AODELU AUTOMATION TECH
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