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We propose an image rejection type direct RF undersampling receiver. By using a direct RF I/Q sample and hold (S/H) circuits, and 90 degree power combiners in the digital domain, upper side band (USB) and lower side band (LSB) signals can be separated into two different (USB and LSB) output ports, therefore the image rejection functionality can be realized with half of the clock frequency of the conventional...
We have developed a high speed gate switching type Ku-band CMOS amplifier for direct RF undersampling receiver. This amplifier will synchronize its d.c. power switch timing to the sampling clock of the direct RF undersampling receiver. For Ku-band VSAT application, we designed the sampling clock frequency of undersampling receiver as 600 MHz, therefore the power switching time (Turn-On Time) of less...
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