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A highly linear and efficient 1-bit digital transmitter with envelope ΔΣ modulation (EDSM) is presented. Analyses and simulations reveal that the EDSM scheme is robust for distortion in output waveforms, and this has been experimentally verified using a CMOS EDSM IC and a GaN class-D PA for the 700-MHz band. The transmitter achieves an average ηD of 56.3% and an ACLR of −39 dBc for a 5-MHz BW and...
We report on a new photon-counting detector possessing unprecedented spatial resolution and moderate spectral resolution for 0.1–100keV X-rays. It consists of an X-ray charge-coupled device (CCD) and a scintillator. The scintillator is directly coupled to the back surface of the X-ray CCD. Low-energy X-rays below 10keV can be directly detected by the CCD. The majority of hard X-rays above 10keV pass...
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