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Several modulation techniques including envelop delta-sigma modulation and envelope pulse width modulation have been applied. The out-of-band quantization noise associated with these modulations may be rejected by a high-quality factor output filter, yet the in-band quantization noise needs to be further suppressed to meet the requirement of the emission mask. The proposed channelized active noise elimination technique can offer additional quantization noise suppression through software control without involving a passive filter. The essential concept is based on combining the outputs of multiple channels of Pas that have digitally controlled delays to form a FIR filter in analogue domain. A two-channel and a four-channel GaN power amplifiers are built to demonstrate this noise suppression concept and power combiners based on T-junction with quarter wavelength transmission line are proposed to retain the high power efficiency of the transmitters.<\/jats:p>","DOI":"10.1186\/s13638-021-02061-8","type":"journal-article","created":{"date-parts":[[2021,11,5]],"date-time":"2021-11-05T12:02:40Z","timestamp":1636113760000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Channelized active noise elimination (CANE) for suppressing quantization noise in bitstream modulated transmitter (BMT)"],"prefix":"10.1186","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3510-5585","authenticated-orcid":false,"given":"Rui","family":"Zhu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yonghoon","family":"Song","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuanxun Ethan","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,11,5]]},"reference":[{"issue":"3","key":"2061_CR1","doi-asserted-by":"publisher","first-page":"121","DOI":"10.1109\/75.661135","volume":"8","author":"A Jayaraman","year":"1998","unstructured":"A. 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