摘要:
The present invention relates to a leakage signal reducing device and method. The present invention uses a signal with varied phase and gain output by a local oscillator to eliminate a leakage signal leaked by a local oscillator to a frequency converter.
摘要:
An ultra wide band (UWB)-based wireless bridge converts wired serial data into a UWB signal with a quality of service, transmits it wirelessly, and inverts the UWB signal into wired serial data. The UWB-based wireless bridge includes: a physical layer processing portion; a protocol converting block; a UWB signal transceiving portion; and a control portion.
摘要:
A micro-miniature, light weighted and low cost trapezoid ultra wide antenna having an ultra wide band characteristics and a notch characteristic in 5 GHz WLAN band (5.15–5.35 GHz) is disclosed. The trapezoid ultra wide antenna includes: a dielectric substrate; a trapezoid shaped patch formed at an upper end of a middle line on an upper side of the dielectric substrate; a feeding line formed at a bottom end of the middle line on the upper side of the dielectric substrate for feeding electric power to the trapezoid shaped patch; a matching stub formed between the trapezoid shaped patch and the feeding line for impedance matching between the trapezoid shaped patch and the feeding line; and a ground formed at a side of the feeding line on the upper side of the dielectric substrate.
摘要:
A micro-miniature, light weighted and low cost trapezoid ultra wide antenna having an ultra wide band characteristics and a notch characteristic in 5 GHz WLAN band (5.15-5.35 GHz) is disclosed. The trapezoid ultra wide antenna includes: a dielectric substrate; a trapezoid shaped patch formed at an upper end of a middle line on an upper side of the dielectric substrate; a feeding line formed at a bottom end of the middle line on the upper side of the dielectric substrate for feeding electric power to the trapezoid shaped patch; a matching stub formed between the trapezoid shaped patch and the feeding line for impedance matching between the trapezoid shaped patch and the feeding line; and a ground formed at a side of the feeding line on the upper side of the dielectric substrate.
摘要:
A digital polar modulator (DPM) for transforming a baseband signal into a modulated digital modulator output signal comprises an input unit and two low-pass delta-sigma modulators, a first one being connected downstream from the first input part and configured to provide at its output a first pulse train in dependence on an amplitude- modulating baseband signal component, and a second one being connected downstream from the second input part and configured to provide at its output a multilevel quantized signal in dependence on a phase modulating baseband signal component; a multiphase generator, which is configured to provide a set of square-wave carrier signals having a common carrier frequency and exhibiting discrete phase shifts with respect to each other; a multiplexer, which is configured to provide a multiplexer output signal that is formed by switching, in dependence on a signal received at a select input as a function of time, between selected ones of the carrier signals; and a combiner unit.
摘要:
A digital polar modulator (DPM) for transforming a baseband signal into a modulated digital modulator output signal comprises an input unit and two low-pass delta-sigma modulators, a first one being connected downstream from the first input part and configured to provide at its output a first pulse train in dependence on an amplitude- modulating baseband signal component, and a second one being connected downstream from the second input part and configured to provide at its output a multilevel quantized signal in dependence on a phase modulating baseband signal component; a multiphase generator, which is configured to provide a set of square-wave carrier signals having a common carrier frequency and exhibiting discrete phase shifts with respect to each other; a multiplexer, which is configured to provide a multiplexer output signal that is formed by switching, in dependence on a signal received at a select input as a function of time, between selected ones of the carrier signals; and a combiner unit.
摘要:
The present invention relates to a signal converting device and receiving device in a wireless communication system. The receiving device of the wireless communication system includes a differential signal converter for receiving a single ended radio frequency signal and converting it into a differential radio frequency signal, and a frequency down converter for down converting the differential radio frequency signal to down frequency signal.
摘要:
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.
摘要:
A radio frequency receiver of the present invention removes out-of-band jamming signals and interference signals without SAW filters. The radio frequency receiver includes: a low noise amplifier amplifying a signal received through an antenna; a second order intermodulation cancellation unit removing second order intermodulation caused by an out-of-band jamming or interference signal included in the signal output from the low noise amplifier; a passive mixer unit converting a frequency of the signal output from the second order intermodulation cancellation unit; and a low pass filter unit removing an out-of-band jamming or interference signal included in the signal output from the passive mixer unit and delivering the signal with the out-of-band jamming or interference signal removed therefrom to a transimpedance amplifier.
摘要:
A radio frequency receiver of the present invention removes out-of-band jamming signals and interference signals without SAW filters. The radio frequency receiver includes: a low noise amplifier amplifying a signal received through an antenna; a second order intermodulation cancellation unit removing second order intermodulation caused by an out-of-band jamming or interference signal included in the signal output from the low noise amplifier; a passive mixer unit converting a frequency of the signal output from the second order intermodulation cancellation unit; and a low pass filter unit removing an out-of-band jamming or interference signal included in the signal output from the passive mixer unit and delivering the signal with the out-of-band jamming or interference signal removed therefrom to a transimpedance amplifier.