CMOS linear-in-dB VGA with DC offset cancellation for direct-conversion receivers |
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| Authors: | Lei Qianqian Chen Zhiming Shi Yin Chu Xiaojie Gong Zheng |
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| Affiliation: | 1. Department of Electronic Engineering, Xi'an University of Technology, Xi'an 710048, China
2. Suzhou-CAS Semiconductors Integrated Technology Research Center, Suzhou 215021, China |
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| Abstract: | A low-power high-linearity linear-in-dB variable gain amplifier(VGA) with novel DC offset calibration loop for direct-conversion receiver(DCR) is proposed.The proposed VGA uses the differential-ramp based technique,a digitally programmable gain amplifier(PGA) can be converted to an analog controlled dB-linear VGA. An operational amplifier(OPAMP) utilizing an improved Miller compensation approach is adopted in this VGA design.The proposed VGA shows a 57 dB linear range.The DC offset cancellation(DCOC) loop i... |
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| Keywords: | linear-in-dB VGA DC offset cancellation |
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