Unlock instant, AI-driven research and patent intelligence for your innovation.

Broadband gain adjustable low-noise amplifier

A low-noise amplifier and gain stage technology, applied in the direction of improving the amplifier to reduce the impact of noise, etc., can solve the problem of difficult to meet high gain and ultra-wideband at the same time, to avoid noise performance deterioration, suppress other noise, and reduce the maximum noise figure. Effect

Active Publication Date: 2012-07-04
NAT UNIV OF DEFENSE TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it can be seen from the figure that the gain (proportional to the impedance amplitude) and the bandwidth are contradictory. If the low noise amplifier adopts a single-stage structure, it is difficult to satisfy high gain and ultra-wideband at the same time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Broadband gain adjustable low-noise amplifier
  • Broadband gain adjustable low-noise amplifier
  • Broadband gain adjustable low-noise amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Please refer to Figure 5 , which is a schematic diagram of a low noise amplifier module with adjustable broadband gain of the present invention. The amplifier includes an input impedance matching circuit 110 , a main gain stage circuit 120 , a gain control stage circuit 130 and an output impedance matching circuit 140 . Wherein the input impedance matching circuit 110 receives the radio frequency input signal from the antenna or other equipment, and is directly connected with the main gain stage circuit 120; the main gain stage circuit 120 receives the signal from the input impedance matching circuit 110, and passes through the DC blocking capacitor Connected with the gain control stage circuit 130; the gain control stage circuit 130 receives the signal from the main gain stage circuit 120, and is connected with the output impedance matching circuit 140 through a DC blocking capacitor; the output impedance matching circuit 140 receives the signal from the gain control ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a broadband gain adjustable low-noise amplifier, which can provide sufficiently high gain, larger gain variation range and high gain flatness, and has a lower noise factor at low frequency. The invention has the technical scheme that the broadband gain adjustable low-noise amplifier comprises an input impedance matching circuit, a main gain stage circuit, a gain control stage circuit and an output impedance matching circuit, wherein the input impedance matching circuit receives radio-frequency input signals from an antenna or other equipment and is directly connected with the main gain stage circuit; the main gain stage circuit receives the signals from the input impedance matching circuit and is connected with the gain control stage circuit through a stopping condenser; the gain control stage circuit receives the signals from the main gain stage circuit and is connected with the output impedance matching circuit through a stopping condenser; and the output impedance matching circuit receives the signals from the gain control stage circuit and outputs the signals through the stopping condenser.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuits, in particular to a low-noise amplifier with adjustable broadband gain, which can be used in digital TV tuners or other broadband communication systems. Background technique [0002] In a broadband communication system, a broadband low-noise amplifier is a very critical module. It must achieve impedance matching within a wide frequency band, provide flat gain, introduce as low noise as possible, and ensure sufficient linear range to accommodate Possible signal energy changes; due to large changes in input signal power, in order to avoid saturated input to the next-level module or input lower than its sensitivity, the broadband low-noise amplifier also needs to have a gain adjustable function to stabilize the output and maximum Optimize the dynamic range requirements of the receiver and reduce the linearity requirements for the next stage circuit. [0003] General gain-adjustable...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26
Inventor 李建成李松亭王宏义谷晓忱汪金真杨青
Owner NAT UNIV OF DEFENSE TECH