Capacitance negative feedback type low noise amplifier

A low-noise amplifier and negative feedback technology, which is applied in the direction of negative feedback circuit layout, improved amplifiers to reduce noise effects, etc., can solve the problems of different amplifier circuits, etc., and achieve the effect of simple circuit structure and easy implementation

Inactive Publication Date: 2010-07-28
HANGZHOU DIANZI UNIV
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Problems solved by technology

However, due to the transistor device itself, the best noise matching p...

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  • Capacitance negative feedback type low noise amplifier
  • Capacitance negative feedback type low noise amplifier
  • Capacitance negative feedback type low noise amplifier

Examples

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Embodiment Construction

[0021] The core technology of the low noise amplifier circuit based on capacitive negative feedback is to introduce a capacitor of appropriate size between the source and drain of the transistor, such as figure 2 shown. It changes the imaginary part X of the optimal input matching impedance value without increasing the original circuit structure (including input matching 1, bias network 2 and power supply 3 in the prior art). S , making it infinitely close to the imaginary part X of the best noise matching impedance opt .

[0022] like image 3 As shown, this embodiment includes a first bias resistor R1, a second bias resistor R2, a third bias resistor R3, a first protection resistor R4, a second protection resistor R5, a feedback resistor R6, a stabilizing resistor R7, a first DC blocking capacitor C1, second DC blocking capacitor C5, first bypass capacitor C2, second bypass capacitor C3, third bypass capacitor C8, fourth bypass capacitor C9, matching capacitor C4, first ...

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Abstract

The invention relates to a capacitance negative feedback type low noise amplifier. The existing low noise amplifier is complex in circuit structure and is existed with outside noise. The invention provides a capacitance feedback type low noise amplifier with simple structure, the low noise amplifier can balance and amplify conflict between noise matching and power matching of circuit without introducing extra outside noise. In the invention, an appropriate capacitance value is added between the source electrode and drain electrode of a field effect tube on the basis of low noise amplifier circuit after initial design, thus optimal input matching point of the low noise amplifier circuit can be close to the optimal noise matching point. The essence thereof is that the real part of optimal input matching impedance of the original amplifying circuit is changed and is caused to be closer to the real part of optimal noise matching impedance of amplifying circuit. The invention is simple in circuit structure and is convenient to implement; and conflict between noise matching and input matching of low noise amplifier can be balanced.

Description

technical field [0001] The invention belongs to the technical field of low-noise amplifiers for ultrashort-wave active devices, and relates to a low-noise amplifier in the form of capacitor negative feedback. Background technique [0002] The low noise amplifier is an extremely important part in the application of modern communication technology and electronic warfare, and is the core device of the receiving system. [0003] In the receiving system, the low noise amplifier is always at the front end. The noise of the whole receiving system depends on the noise of the low noise amplifier. Compared with ordinary amplifiers, on the one hand, low noise amplifiers can reduce the clutter interference of the system and improve the sensitivity of the system; on the other hand, they can amplify the signals required by the system to ensure the normal operation of the system. The performance of the low-noise amplifier not only restricts the performance of the entire receiving system,...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F1/34
Inventor 官伯然余益伟肖艳
Owner HANGZHOU DIANZI UNIV
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