Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Amplifier system, and method and circuit for controlling main amplifier

A main amplifier and amplifier technology, applied in the direction of amplification control, amplifier, power amplifier, etc., can solve the problems of increasing the peak current/voltage of the power amplifier, reducing the quality of service, etc., and achieve the effect of reducing the change of the output power and changing the stability.

Inactive Publication Date: 2017-08-18
MEDIATEK INC
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variations in output power may degrade service quality and / or increase peak current / voltage of the power amplifier

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
  • Amplifier system, and method and circuit for controlling main amplifier
  • Amplifier system, and method and circuit for controlling main amplifier
  • Amplifier system, and method and circuit for controlling main amplifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Certain terms are used throughout the specification and following claims to refer to particular components. Those skilled in the art should understand that manufacturers of electronic equipment may use different terms to refer to the same component. The specification and subsequent claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for the difference. The "comprising" mentioned throughout the specification and the following claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes any direct and indirect means of electrical connection. Therefore, if it is described herein that a first device is electrically connected to a second device, it means that the first device may be directly connected to the second device, or indirectly connected to the second device through other devices or connection means...

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 an amplifier system, and a method and circuit for controlling a main amplifier. The amplifier system includes a main amplifier and a controller, the main amplifier comprises a first transistor and a second transistor connected in a cascode structure, wherein the main amplifier receives the input signal using the first transistor and outputs the output signal with the second transistor; the controller is coupled to the main amplifier for generating a control signal based on the output signal and the current of the main amplifier to the second Transistor to control the gain of the main amplifier. The present invention can reduce the variation in the output power of the amplifier in the case of different VSWRs so that the output signal is sufficiently robust with respect to the VSWR variation.

Description

technical field [0001] The present invention relates to the field of amplifiers, and more specifically, relates to an amplifier system capable of controlling a power amplifier to make output power more stable, and a method and circuit for controlling a main amplifier. Background technique [0002] In a radio frequency (radio frequency, RF) transmitter, the output power of a power amplifier is related to the output impedance (including load impedance) of the power amplifier. Because the load impedance may vary due to changes in the VSWR (Voltage Standing Wave Ratio, VSWR), and different distances from the antenna to foreign objects will lead to changes in the VSWR, and thus the output power of the power amplifier will vary accordingly. Variations in output power may degrade service quality and / or increase peak current / voltage of the PA. Therefore, how to design a controller to control the power amplifier to stabilize the output power is an important issue. Contents of the ...

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 Applications(China)
IPC IPC(8): H03F3/193H03F3/21H03K5/1532
CPCH03F3/193H03F3/21H03F2200/153H03F2200/234H03F2200/258H03F2200/451H03F2200/462H03G3/3042H03K5/1532H03F1/223H03F1/523H03F3/195H03F3/245H03F3/45179H03F3/45475H03F3/72H03F2200/108H03F2200/18H03F2200/228H03F2200/301H03F2200/393H03F2200/435H03F2200/441H03F2200/471H03F2200/477H03F2200/481H03F2200/498H03F2200/555H03F2200/75H03F2200/78
Inventor 林来庆蔡明达
Owner MEDIATEK INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com