I/Q demodulator and I/Q signal sampling method thereof

An I/Q signal generating method, comprising:

• generating I and Q signals with respect to an input data signal;
• decimating the I and Q signals, to output effective I and Q signals;
• and
• filtering the effective I and Q signals.

An I/Q demodulator comprising:

• first and second decimation units which decimate even-numbered input data signals and odd-numbered input data signals, respectively;
• first and second multiplexers which generate an I signal of an inphase component and a Q signal of a quadrature component with respect to the decimated even-numbered data signals and the odd-numbered data signals, respectively;
• and
• a filtering unit which filters the I and Q signals output from the first and second multipelxers, respectively.

A method of generating an I/Q signal, comprising:

• separating an even-numbered input data signal from an odd-numbered input data signal;
• generating an I signal of an inphase component and a Q signal of a quadrature component with respect to the even-numbered and odd-numbered data signals, respectively;
• and
• filtering the I and Q signals.

An I/Q demodulator, comprising:

• a first multiplexer which multiplexes an input signal and other signals to output an I signal;
• a second multiplexer which multiplexes the input signal and the other signals to output a Q signal;
• a delay unit which delays the I signal;
• a first decimation unit which decimates the delayed I signal;
• a second decimation unit which decimates the Q signal;
• and
• first and second filters which filter the decimated I and Q signals, to output effective I and Q signals.

An I/Q demodulator, comprising:

• a delay unit which delays an input data signal and outputs a delayed input signal;
• first and second decimation units which decimate the input data signal and the delayed input signal, respectively;
• a first multiplexer which multiplexes the decimated delayed input data signal and a negative of the delayed input signal to output an I signal;
• a second multiplexer which multiplexes the decimated non-delayed input data signal and a negative of the non-delayed input signal to output a Q signal;
• and
• first and second filters which filter the I and Q signals, to output effective I and Q signals, respectively.

An I/Q demodulator, comprising:

• a first multiplexer which multiplexes an input signal and other signals to output an I signal;
• a second multiplexer which multiplexes the input signal and the other signals to output a Q signal;
• first and second upsampling units which upsample the I and Q signals, respectively;
• first and second delay units which delay the upsampled I and Q signals, respectively;
• first and second decimation units which decimate the delayed I and Q signals, respectively;
• first and second low pass filters which filter the decimated I and Q signals;
• and
• first and second M-downsampling units which M-downsample the decimated I and Q signals, to output effective I and Q signals, wherein the M of each M-downsampling unit is even.

An I/Q demodulator, comprising:

• a first multiplexer which multiplexes an input signal and other signals to output an I signal;
• a second multiplexer which multiplexes the input signal and the other signals to output a Q signal;
• first and second upsampling units which upsample the I and Q signals, respectively;
• a delay unit which delays the upsampled I signal;
• first and second decimation units which decimate the delayed I signal and the Q signal, respectively;
• first and second low pass filters which filter the decimated delayed I signal and the decimated Q signal, respectively;
• and
• first and second M-downsampling units which M-downsample the filtered decimated delayed I signal and the filtered decimated Q signal, to output effective I and Q signals, respectively, wherein the M of each M-downsampling unit is odd.

An I/Q demodulator, comprising:

• a delay unit which delays an input data signal and outputs a delayed input signal;
• first and second decimation units which decimate the input data signal and the delayed input signal, respectively;
• a first multiplexer which multiplexes the decimated delayed input data signal and a negative of the delayed input signal to output an I signal;
• a second multiplexer which multiplexes the decimated non-delayed input data signal and a negative of the non-delayed input signal to output a Q signal;
• first and second upsampling units which upsample the I and Q signals, respectively;
• first and second filters which filter the upsampled I and Q signals, respectively;
• and
• first and second M-downsampling units which M-downsample the filterd I and Q signals, respectively, to output effective I and Q signals, respectively.