US 9,425,750 B2Granted

Radio frequency communication system and noise isolation method applied thereto

AssigneeASUSTeK COMPUTER INC.

InventorsGuo-Ying Hung, I-Tang Chung

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Abstract

A radio frequency communication system and a noise isolation method applied to the radio frequency communication system are provided. The radio frequency communication system includes an antenna, an amplifier and a noise isolating unit. The amplifier is electrically connected to the antenna to amplify a common-mode signal transmitted by the antenna and outputs an amplified common-mode signal. The noise isolating unit is electrically connected to the amplifier to isolate the amplified common-mode signal. The noise isolating unit includes a first transformer and a second transformer. The noise isolating unit isolates the common-mode signal and transmits the differential-mode signal, which can effectively reduce the noise and improve a signal to noise ratio without affecting the original signal.

Claims6

Dependent claims

A radio frequency communication system, comprising;

an antenna;
an amplifier electrically connected to the antenna to amplify a common-mode signal transmitted by the antenna and outputting an amplified common-mode signal;
and a noise isolating unit electrically connected to the amplifier to isolate the amplified common-mode signal, wherein the noise isolating unit includes;
a first transformer including a first primary winding and a first secondary-winding, wherein the first primary winding is electrically connected to the amplifier;
a second transformer including a second primary winding and a second secondary winding, wherein the second primary winding is electrically connected to the first secondary winding to isolate the transmission of the amplified common-mode signal;
and a plurality of capacitors;
wherein, the first transformer cooperates with at least one of the capacitors to isolate the transmission of a part of the amplified common-mode signal, and the second transformer cooperates with at least one of the capacitors to Isolate the -transmission of a remaining part of the amplified common-mode signal.

4 more elements

A noise isolation method applied to a radio frequency communication system, wherein the radio frequency communication system includes an antenna, an amplifier and a noise isolating unit, die noise isolating unit includes a first transformer and a second transformer and a plurality of capacitors, the first transformer includes a first primary winding and a first secondary winding, the first primary winding is electrically connected to the amplifier, die second transformer includes a second primary winding and a second secondary' winding, and the second primary winding is electrically connected to the first secondary winding, the noise isolation method comprising following steps:

transmitting a common-mode signal by the antenna;
amplifying the common-mode signal and outputting the amplified common-mode signal by the amplifier;
and
isolation the transmission of a part of the amplified common-mode signal via, the cooperation of the first transformer and at least one of the capacitors of the noise isolating unit:
and
isolating the transmission of a remaining part of the amplified common-mode signal via the cooperation of the second transformer and at least one of the capacitors of the noise isolating unit.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/490,686Filed 19 Sep 2014
Priority: TW 102134132 A23 Sep 2013
Published: US 2015/0087250 A126 Mar 2015
Granted: 23 Aug 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03F 3/191
With semiconductor devices only: tuned amplifiers
H03H 2/006
Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers: transmitter or amplifier output circuits
H03F 2200/294
Indexing scheme relating to amplifiers: the amplifier being a low noise amplifier [LNA]
H03H 7/09
Frequency selective two-port networks: filters comprising mutual inductance