摘要:
A polar transmitter using a binary phase shift key (BPSK) method includes a data dividing unit which divides input data into an amplitude component and a phase component, a frequency synthesizer which produces an I value of a passband having a phase component of an I signal and a Q value of a passband having a phase component of a Q signal, a polar modulation circuit for the I signal which produces an I carrier wave to the I signal using the amplitude component from the data dividing unit and the I value from the frequency synthesizer, a polar modulation circuit for the Q signal which produces a Q carrier wave to the Q signal using the amplitude component and the Q value, and a carrier wave producing unit which combines the I carrier wave and the Q carrier wave thus to produce a carrier wave.
摘要:
Provided is a polar transmitter which increases a modulation rate using a multi-phase generator and includes: a data processor which processes and separates incoming data to an amplitude component and a phase component; a multi-phase generator which generates a plurality of carriers having a plurality of phase components by processing a carrier having a certain frequency; a selection output part which selects and outputs a carrier having a phase substantially equal to the phase component; and a carrier output part which synthesizes the output carrier with the amplitude component and outputs a carrier. Accordingly, the modulation rate of the carrier can be increased and the bandwidth can be extended with the related art polar transmitter. Therefore, the polar transmitter is applicable to the wideband communications, the multi-mode, and the multi-band.
摘要:
A wire-stacked transformer has a first loop supplied with electric power and built with one or more metal plates forming a magnetic field, a second loop disposed in a concentric circle with the first loop and generating induction current, and loop wires disposed between the respective metal plates of the first loop and supplying electric power to each metal plate. Accordingly, efficiency of a power amplifier can be enhanced by reducing the loss of the DAT.