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US 2003/0112894 A1Published application
Modulator of phase shift keying (PSK) type
AssigneeMagnaChip Semiconductor, Ltd.
InventorDae-Hun Lee
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Abstract
A modulator phase shift keying modulator for performing data modulation by using the phase difference of each I/Q channel, comprising a data shifter for controlling delay of I/Q channel digital data at input terminals of the I/Q channels.
Claims10
A phase shift keying modulator for performing data modulation by using a phase difference between I/Q channels, comprising a data shifter for controlling delay of I/Q channel digital data at input terminals of the I/Q channels.
- a first data shifting means for controlling delay of I channel digital data;
- a second data shifting means for controlling delay of Q channel digital data.
A phase shift keying modulator for performing data modulation by using a phase difference between channels, comprising:
- first and second digital-to-analog converting means for converting outputs of the first and second data shifting means into analog signals, respectively;
- first and second filtering means for filtering outputs of the first and second digital-to-analog converting means, respectively;
- a mixing means for carrying outputs of the first and second filtering means with first and second carrier signals having a predetermined phase difference and generating one signal;
- and
- a delay control means for detecting phase mismatch between outputs of the first and second filtering means and phase mismatch between the first and second carrier signals and controlling delay of the first and second data shifting means by as much as the detected phase mismatch.
2 more elements
Dependencies are inferred from the claim text.