Abstract:
A pulse shaping circuit is configured to shape a waveform of an edge of a signal applied to a switch of a power amplifier included in an on-off keying transmitter.
Abstract:
An ultra-low power wireless communication apparatus and an ultra-low power wireless communication method are provided. The ultra-low power wireless communication apparatus includes a sensing unit configured to sense state information of frequency channels in a frequency band. The ultra-low power wireless communication apparatus further includes a channel determining unit configured to divide the frequency band into frequency bands based on an allowable output power, assign a priority to one of the frequency bands that includes an output power that is less than or equal to the allowable output power, and determine a communication channel based on the state information of the frequency channels.
Abstract:
A microstrip patch antenna includes a via-hole pad including via-holes, a patch disposed on the via-hole pad, a feeding via-hole disposed at a side of the patch through the patch and the via-hole pad, and a shorting via-hole disposed at a side of the patch, and configured to connect the patch and a ground unit.
Abstract:
A receiver and a transmitter that copes with interference in a super-regenerative communication system, and a method of using the receiver and the transmitter, are provided. A super-regenerative receiver includes a resonance frequency adjusting unit configured to adjust a resonance frequency associated with a filtering band of a transmission signal that is received from a transmitter. The super-regenerative receiver further includes an oscillation signal generating unit configured to generate an oscillation signal, using a positive feedback amplification, based on the resonance frequency and the transmission signal. The super-regenerative receiver further includes an oscillation characteristic detecting unit configured to detect a characteristic of the oscillation signal. The super-regenerative receiver further includes a determining unit configured to determine whether interference is included in the transmission signal based on the characteristic of the oscillation signal and the resonance frequency.
Abstract:
An antenna is described including a slot formed in a cavity, a substrate configured to cover a portion of the cavity and the slot, and a first port and a second port configured to supply power to the antenna using a first feeding line and a second feeding line. Each of the feeding line and the second feeding line is connected to the slot in a vertical direction and disposed to be separate from one another. A first input impedance of the antenna from the first port differs from a second input impedance of the antenna from the second port.
Abstract:
A power circuit for reducing a leakage power using a negative voltage is provided. The power circuit includes a current source including a transistor including a gate. The power circuit further includes a current source control circuit connected to the gate of the transistor, and configured to apply a positive voltage to the gate of the transistor if the current source is to operate in an active mode, and apply the negative voltage to the gate of the transistor if the current source is to operate in an inactive mode.
Abstract:
Provided is a method and an apparatus to calibrate an output of an oscillator. The method includes calibrating the output frequency of the oscillator to be a predetermined frequency. The method also generates a differential signal corresponding to the calibrated frequency, and operates the oscillator in response to the differential signal. The oscillator is controlled by the differential signal to remove common mode noise.
Abstract:
A receiver and a transmitter that copes with interference in a super-regenerative communication system, and a method of using the receiver and the transmitter, are provided. A super-regenerative receiver includes a resonance frequency adjusting unit configured to adjust a resonance frequency associated with a filtering band of a transmission signal that is received from a transmitter. The super-regenerative receiver further includes an oscillation signal generating unit configured to generate an oscillation signal, using a positive feedback amplification, based on the resonance frequency and the transmission signal. The super-regenerative receiver further includes an oscillation characteristic detecting unit configured to detect a characteristic of the oscillation signal. The super-regenerative receiver further includes a determining unit configured to determine whether interference is included in the transmission signal based on the characteristic of the oscillation signal and the resonance frequency.
Abstract:
The present disclosure relates to power receiving devices and methods. An example power receiving device comprises an antenna cell array configured to receive a radio frequency (RF) signal from a transmission device, where the antenna cell array includes a first antenna cell and a second antenna cell, a first rectifier connected to the first antenna cell and having first maximum rectification efficiency when an input signal of the first rectifier has a first power value, a second rectifier connected to the second antenna cell and having second maximum rectification efficiency when an input signal of the second rectifier has a second power value different from the first power value, a first voltage converter configured to perform a first conversion of an output of the first rectifier, and a second voltage converter configured to perform a second conversion of an output of the second rectifier.
Abstract:
An antenna having a broad bandwidth and a high radiation efficiency is provided. The antenna includes a conductor, and a dielectric substrate disposed on the conductor. The antenna further includes a slot portion formed on the dielectric substrate, and a cavity formed in the dielectric substrate that corresponds to the slot portion.