摘要:
Provided is an apparatus for controlling lighting brightness including a light control unit that generates a control signal for controlling the brightness of a plurality of lightings; a digital signal generating unit that converts a signal corresponding to the control signal at each period so as to generate non-periodic digital signals; and a driving voltage generating unit that generate driving voltages by converting the digital signals into analog signals.
摘要:
There is provided an RC oscillation circuit capable of adjusting an oscillation frequency, and an oscillation method thereof. The RC oscillation circuit including: an RC oscillator including a variable resistor and a variable capacitor, the RC oscillator generating an RC oscillating signal having a frequency determined by a resistance of the variable resistor and a capacitance of the variable capacitor; a counter counting a clock number of a reference oscillating signal corresponding to one period of the RC oscillating signal to generate a first count value, the reference oscillating signal having a preset frequency; and a frequency controller controlling a frequency of the RC oscillating signal by determining the resistance of the variable resistor and the capacitance of the variable capacitor such that a difference between the first count value and a preset second count value is smaller than a preset first critical value.
摘要:
An RC oscillation circuit and method capable of adjusting an oscillation frequency includes: an RC oscillator including a variable resistor and a variable capacitor, the RC oscillator generating an RC oscillating signal having a frequency determined by a resistance of the variable resistor and a capacitance of the variable capacitor; a counter counting a clock number of a reference oscillating signal corresponding to one period of the RC oscillating signal to generate a first count value, the reference oscillating signal having a preset frequency; and a frequency controller controlling a frequency of the RC oscillating signal by determining the resistance of the variable resistor and the capacitance of the variable capacitor such that a difference between the first count value and a preset second count value is smaller than a preset first critical value.
摘要:
Provided is an apparatus for controlling lighting brightness including a light control unit that generates a control signal for controlling the brightness of a plurality of lightings; a digital signal generating unit that converts a signal corresponding to the control signal at each period so as to generate non-periodic digital signals; and a driving voltage generating unit that generate driving voltages by converting the digital signals into analog signals.
摘要:
There is provided a lighting control apparatus using digital sigma-delta modulation, the apparatus including: a control part supplying a brightness control signal; a sigma-delta modulation part generating a carry signal according to the brightness control signal of the control part and a predetermined threshold signal by using a sigma-delta modulation method; and a lighting driving part generating a driving current according to the carry signal of the sigma-delta modulation part and supplying the generated driving current to a lighting part.
摘要:
The present invention relates to a multiple differential demodulator using a weighting value. The multiple differential demodulator according to the present invention includes a weighting value generator for integrating a real part and an imaginary part of a value acquired by multiplying one of a plurality of differentiated reception signals by a conjugated value of a differentiated PN code signal corresponding to a preset symbol, and determining the greater of the integrated real and integrated imaginary parts to apply a predetermined weighting value to the greater value, where the PN code signal is differentiated in the same fashion as the differentiated reception signals.
摘要:
The invention relates to a symbol detector for detecting symbols received in a receive modem of short-range wireless personal area network of a ZigBee system (IEEE 802.15.4). An OQPSK short-range wireless communication system according to the invention acquires frequency offset in a received signal using a symbol contained in a preamble of a packet of the signal, multi-delay-differentiates the signal by a plurality of predetermined delay times, and complex-conjugates the acquired frequency offset to eliminate the frequency offset. Then, the OQPSK short-range wireless communication system according to the invention correlates the received signal with a PN sequence delay-differentiated through the same process to detect the symbols corresponding to the received signal.
摘要:
There is provided a sleep current adjusting circuit of a system on chip including: a regulator supplying a turn-on voltage and a normal current when a mode selection signal is a normal mode signal, and a turn-off voltage when the mode selection signal is a sleep mode signal; a switching device turned on by the turn-on voltage of the regulator to supply the normal current from the regulator to a main circuit part and a sleep operation circuit part, respectively, and turned off by the turn-off voltage of the regulator to block the normal current from being supplied to the main circuit part and supply the sleep current to the sleep operation circuit part; and a current limit device limiting an operating current flowing in response to the operating voltage and supplying the sleep current to the sleep operation circuit part.
摘要:
Provided is a low-power ZigBee device provided with a sleeping mode and an active mode including a power supplying unit for supplying a power; a Medium Access Control (MAC) processing unit for receiving a wake-up packet and for controlling a modem unit and an Radio Frequency (RF) unit; and a Central Processing Unit (CPU) for receiving and processing a data packet, wherein the MAC processing unit makes the power supplying unit apply a power to the CPU based on a result of checking an identification (ID) of the wake-up packet.
摘要:
Provided is a low-power ZigBee device provided with a sleeping mode and an active mode including a power supplying unit for supplying a power; a Medium Access Control (MAC) processing unit for receiving a wake-up packet and for controlling a modem unit and an Radio Frequency (RF) unit; and a Central Processing Unit (CPU) for receiving and processing a data packet, wherein the MAC processing unit makes the power supplying unit apply a power to the CPU based on a result of checking an identification (ID) of the wake-up packet.