[SOLVED] half-band bandpass filter

[jiangfux]

In manual of AD9122 from Analog Devices, It mention that Half-Band Filter 1 (HB1) has four modes of operation. In mode 2, this filter is bandpass filter.
In my mind, half-band filter is either lowpass or highpass. Can someone please show me some page that introduce me half-band bandpass filter.

 

[Mityan]

Not highpass. The signal band is concentrated at both sides near every integer multiple of sampling frequency (like DC on Figure 1 in datasheet)
So if you take just a highpass, you will have all the mirrored signals concentrated near 2*fs, 3*fs etc.

 

[jiangfux]

Not highpass. The signal band is concentrated at both sides near every integer multiple of sampling frequency (like DC on Figure 1 in datasheet)
So if you take just a highpass, you will have all the mirrored signals concentrated near 2*fs, 3*fs etc.

Thanks for your replay.