Radio frequency transceiver

Patent metadata

Field	Value
Publication number	US-RE48618-E
Application number	US-201916502878-A
Country	US
Kind code	E1
Filing date	Jul 3, 2019
Priority date	Jul 16, 2003
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

Provided is a radio frequency transceiver. The radio frequency transceiver includes: a receiving unit for converting a radio frequency signal received by an antenna into an intermediate signal based on an intermediate local signal; a transmitting unit for converting an intermediate signal into a radio frequency signal based on a radio frequency local signal; and a local signal generating unit for generating the intermediate local signal and the radio frequency local signal.

First claim

What is claimed is:

1. An apparatus for transmitting/receiving a radio frequency signal, comprising:
a receiving means for converting a radio frequency signal received by an antenna into an intermediate signal based on an intermediate frequency (IF) band local signal a radio frequency (RF) band local signal;
a transmitting means for converting an intermediate signal into a radio frequency signal based on a radio frequency (RF) the RF band local signal; and
a local signal generating means for generating the IF an intermediate frequency (IF) band local signal and the RF band local signal, wherein said local signal generating means includes:
a phase locked loop (PLL) for both the receiving means and the transmitting means for selecting a channel to reduce interference with the radio frequency signal;
a voltage control oscillator for generating a first local signal based on the channel selected by the PLL;
a multiplier for multiplying the frequency of the first local signal by a predetermined number to generate a multiplied signal;
an amplifier for amplifying the multiplied signal to generate the RF band local signal;
a divider for dividing the frequency of the first local signal by a predetermined number to generate a divided signal; and
a phase shifter for shifting a phase of the divided signal to generate the IF band local signal.

2. The apparatus as recited in claim 1 , wherein said receiving means includes:
a low noise amplifier for amplifying the received signal to generate an amplified radio frequency signal;
a down-converter for converting the amplified radio frequency signal into the intermediate signal by combining the amplitied amplified radio frequency signal and the IF RF band local signal;
a receiving gain controller for controlling a level of the intermediate signal;
a demodulator for demodulating the intermediate signal based on the IF band local signal to generate an in-phase signal and a quadrature-phase signal;
a filter for removing radio frequency noises included in the in-phase signal and the quadrature-phase signal, to thereby generate a filtered in-phase signal and a quadrature-phase signal; and
an analog-to-digital (A/D) converter for converting the filtered in-phase signal and the quadrature-phase signal to digital in-phase and quadrature-phase signals.

3. The apparatus as recited in claim 1 , wherein said transmitting means includes:
a digital-to-analog (D/A) converter for converting the signals from the a baseband modem to analog signals;
a modulator for modulating the analog signals into intermediate signals based on the IF band local signal to generate a modulated signal;
a transmitting gain controller for controlling a level of the modulated signal to generate a gain controlled signal;
an up-converter for converting the gain controlled signal which is in IF band to a radio frequency signal based on the RF band local signal; and
an amplifier for amplifying the radio frequency signal.

4. The apparatus as recited in claim 1 , further including:
switching means for allowing one of said receiving means and said transmitting means to be operated; and
filtering means for removing noise of the transmission radio frequency signal and the received signal.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Park Bong-Hyuk
• Kim Jong-Won
• Jun Yong-Il
• Lee Hyeong-Ho

Classifications

• H04B1/405 Primary

  with multiple discrete channels · CPC title

• H04B1/28 Primary

  the receiver comprising at least one semiconductor device having three or more electrodes · CPC title

• H04B1/40 Primary

  Circuits · CPC title