摘要:
The receiver comprises a variable gain amplification unit, a mixing unit, a filtering unit, and three compensation unit. Each compensation unit detects powers of the signal amplified in the variable gain amplification unit, the signal down-converted in the mixing unit and the signal filtered in the filtering unit. A gain of the variable gain amplification unit is adjusted based on the powers detected by three compensation units.
摘要:
Provided is a parallel-varactor capacitor. The capacitor comprises a first varactor and a second varactor. The first varactor has a first capacitance which varies depending on voltages applied to a first anode and a first cathode. The second varactor has a second capacitance which varies depending on voltages applied to a second anode and a second cathode. The first anode is connected to the second cathode and the first cathode is connected to the second anode.
摘要:
An integrated circuit chip and a package supported by a device or a semiconductor chip are provided. The integrated circuit chip comprises a substrate, a device part, and a first integrated circuit chip. The device part is formed over the substrate, and the first integrated circuit chip is formed over the device part. The area occupied by the integrated circuit chip can be reduced. This reduction in area allows miniaturization of devices, cost reduction, improvement in productivity, and minimization of an occurrence of electrical interference between integrated circuit chips. As a result, it is possible to prevent degradation of the performance.
摘要:
Provided are a radio frequency identification (RFID) reader and a RFID system. Particularly, the RFID reader uses a listen before talk (LBT) mode to identify. A reader for RFID comprises a data path block receiving a tag data signal, a search path block receiving a channel search signal, and a path selection block selecting one of the data path block and the search path block.
摘要:
An amplifier circuit improved in linearity and frequency band comprises an amplification block, a feedback block and an output block. The amplification block comprises a main transistor, an auxiliary transistor, a first capacitor, a second capacitor, a main transistor bias unit, and an auxiliary transistor bias unit. The main transistor bias unit comprises a first bias resistor. The auxiliary transistor bias unit comprises a second bias resistor. The feedback block comprises first and second feedback resistors, and the output block comprises an output resistor and an output transistor.
摘要:
A terrestrial-digital multimedia broadcasting (T-DMB) and digital audio broadcasting (DAB) low intermediate frequency (IF) receiver comprises a low noise amplifier (LNA) 202, an image rejection down-conversion mixer 203, a low pass filter 204, an amplifier 205, a local oscillator 208, a phase-locked loop 209, and an automatic gain controller (AGC) 211. Particularly, the LNA, the image rejection down-conversion mixer, the low pass filter, the amplifier, the AGC, the local oscillator, and the phase-locked loop are integrated in monolithic semiconductor integrated circuit substrate. The AGC supplies a gain control signal to the LNA and the amplifier according to the magnitude of the RF signal, and the gain control signal is controlled by a null control signal based on a null signal comprised in a received radio frequency (RF) signal.
摘要:
A tuning circuit of a filter is disclosed to correct a cut-off frequency of the filter. The tuning circuit comprises a current generation unit (210) which includes a first transistor (MN21) and a resistor (R), and a capacitor compensation unit (220) which includes a second transistor (MN22) and a capacitor unit (223).
摘要:
Disclosed herein is an amplifier circuit having improved linearity and frequency band using a MGTR. The amplifier circuit comprises an amplification unit including a main transistor (MN31) and an auxiliary transistor (MN32), an attenuation unit including inductors (L31) respectively connected to the source of the main transistor (MN31) and the source of the auxiliary transistor (MN32), a capacitor (C31) connected at one end thereof to the sources of the main transistor (MN31) and auxiliary transistor (MN32) and connected at the other end thereof to the gates of the main transistor (MN31) and auxiliary transistor (MN32), and an output unit (R31) connected to the drains of the main transistor (MN31) and auxiliary transistor (MN32).
摘要:
The present invention relates to a differential amplifier and a mixer for improving the linearity. The differential amplifier circuit according to this present invention, includes first and second load stages each having a predetermined voltage value, a main differential amplifier unit having a first differential stage that forms a differential pair in such a way as to amplify a difference between a first input voltage and a second input voltage, and a constant current source, which has a predetermined current driving capability and is connected serially between a power source voltage terminal and a ground terminal, and a auxiliary differential amplifier unit having a second differential stage that forms a differential pair in such a way as to amplify a difference between a third input voltage and a fourth input voltage connected between the first load stage and a second load stage, and the ground, respectively.
摘要:
Provided is a reader (120) for radio frequency identification (RFID) and a RFID system. A reader for RFID that receives a channel signal comprises a frequency oscillator (201) generating an oscillating signal at a frequency that is offset by an offset frequency from a center frequency of the channel signal, a mixer (202) mixing the channel signal with the oscillating signal that is offset, and a filter (203) filtering a mixed frequency signal provided from the mixer. The reader for RFID and the RFID system are improved in reception for the wave identification using a listen before talk (LBT) mode for identifying an electronic tag.