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Signal receiving circuit and wireless communication system

a technology of receiving circuit and wireless communication system, which is applied in the direction of amplification control details, electrical equipment, amplification control, etc., can solve the problems of increasing the linearity of the receiving system and the increase of the noise figure, affecting the sensitivity of the receiving system, etc., and achieves the effect of improving flexibility

Active Publication Date: 2020-08-27
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure provides a signal receiving circuit and wireless communication system that use a switch circuit to determine whether the radio frequency signal is amplified. This improves the flexibility of the receiving system to handle different signals and allows for adjustment of the gain to prevent signal distortion during amplification. The technical effect is better performance and reliability of the wireless communication system.

Problems solved by technology

However, when decreasing the gain of the low noise amplifier, the linearity of the receiving system is increased, but the noise figure is also increased to affect the sensitivity of the receiving system.

Method used

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  • Signal receiving circuit and wireless communication system
  • Signal receiving circuit and wireless communication system

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Embodiment Construction

[0009]In this document, the term “circuitry” may indicate a system formed with one or more circuits. The term “circuit” may indicate an object, which is formed with one or more transistors and / or one or more active / passive elements based on a specific arrangement, for processing signals.

[0010]For ease of understanding, like elements in figures are designated with the same reference numbers.

[0011]Reference is made to FIG. 1, which is a functional block diagram illustrating a wireless communication system 100 according to one embodiment of the present disclosure. The wireless communication system 100 includes an antenna 110 and a signal receiving circuit 130. The antenna 110 is disposed outside a chip and electrically coupled to a pad 150. The signal receiving circuit 130 is disposed inside the chip and electrically coupled to the pad 150. In the embodiment, the antenna 110 operates in a first frequency band and a second frequency band, wherein the first frequency band includes the Wi...

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Abstract

A signal receiving circuit includes a first amplifier, a switch circuit, a second amplifier and a mixer. The first amplifier is configured to amplify a radio frequency (RF) signal to generate a first amplified RF signal. The switch circuit is configured to receive the first amplified RF signal. The second amplifier is configured to receive and amplify the first amplified RF signal to generate a second amplified RF signal. The mixer is configured to modulate one of the first amplified RF signal and the second amplified RF signal to generate a mixed signal, wherein the switch circuit is configured to determine whether the first amplified RF signal is amplified by the second amplifier.

Description

RELATED APPLICATIONS[0001]This application claims priority to Taiwan Application Serial Number 108106888, filed Feb. 27, 2019, which is herein incorporated by reference in its entirety.BACKGROUNDTechnical Field[0002]The present disclosure relates to a signal receiving circuit. More particularly, the present disclosure relates to a signal receiving circuit and wireless communication system for switching different low noise amplifier.Description of Related Art[0003]As system integration and interference in the environment increases, the receiver of the wireless communication system needs to enhance the anti-jamming function in addition to better sensitivity. Especially when the frequency band of the interference signal overlaps the frequency band of the received signal, the linearity of the low noise amplifier (LNA) needs to be improved without affecting the sensitivity of the reception. However, when decreasing the gain of the low noise amplifier, the linearity of the receiving syste...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/12H04B1/00H03G3/00
CPCH04B1/123H04B1/006H03G3/007H04B1/16H03G3/3052H03G1/0088
Inventor CHAN, KA-UNTSAI, HAN-TING
Owner REALTEK SEMICON CORP