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 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:
The present invention relates to a receiver, and more particularly, to a Zero-IF receiving apparatus for digital multimedia broadcasting (DMB). The Zero-IF receiver for DMB according to the present invention comprises a first receiver that comprises a first mixer, a first Low-Pass Filter (LPF) and a first Low-Noise Amplifier (LNA) and forms an I channel, a second receiver that comprises a second mixer, a second LPF and a second LNA and forms a Q channel, a Phase Locked Loop (PLL), a Local Oscillator (LO) and a Phase Local Oscillator (PLO). An input terminal of each of the first mixer of the first receiver and an input terminal of the second mixer of the second receiver are connected to an output terminal of a LNA that amplifies a satellite frequency signal. Furthermore, an input terminal of the first mixer of the first receiver and an input terminal of the second mixer of the second receiver are connected to output terminals of the PLL, the LO and the PLO.
摘要:
Provided is a semiconductor package manufacturing method. The method comprises forming a metal circuit pattern on a substrate; connecting an integrated circuit unit to the metal circuit pattern; forming a resin on the substrate, the metal circuit pattern and the integrated circuit unit; and removing the substrate.
摘要:
Provided is a semiconductor package manufacturing method. The method comprises forming a metal circuit pattern on a substrate; connecting an integrated circuit unit to the metal circuit pattern; forming a resin on the substrate, the metal circuit pattern and the integrated circuit unit; and removing the substrate.
摘要:
An amplifier circuit improved in linearity and frequency band comprises an amplification block (310), a feedback block and an output block. The amplification block (310) comprises a main transistor (MN31), an auxiliary transistor (MN32), a first capacitor (C31), a second capacitor (C32), a main transistor bias unit (321), and an auxiliary transistor bias unit (322). The main transistor bias unit (321) comprises a first bias resistor (Rb31). The auxiliary transistor bias unit (322) comprises a second bias resistor (Rb32). The feedback block (320) comprises first (R31) and second (R32) feedback resistors, and the output block (330) comprises an output resistor (Rout) and an output transistor (MNout).
摘要:
Provided is a terrestrial-digital multimedia broadcasting (T-DMB) and digital audio broadcasting (DAB) low intermediate frequency (IF) receiver. A T-DMB and DAB low 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, and a phase-locked loop 209. Particularly, the LNA, the image rejection down-conversion mixer, the low pass filter, the amplifier, the local oscillator, and the phase-locked loop are integrated in a monolithic semiconductor integrated circuit substrate. Using the T-DMB and DAB low IF receiver allows a removal of a conventional SAW filter and the T-DMB and DAB low IF receiver can be easily integrated in the monolithic semiconductor integrated circuit substrate, and manufactured at low costs.
摘要:
Provided is a frequency control loop circuit changing division ratios of a frequency synthesizer to oscillate frequencies in a broadband with high precision. The circuit comprises a clock oscillator, a frequency synthesizer, and a demodulator.