Fine and coarse phase and amplitude control
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United States of America Patent
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Mar 13, 2018
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app pub date -
Jan 24, 2017
filing date -
Jan 24, 2017
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Abstract
A digitally controlled phase shifter and (optional) attenuator circuit that has both a broad range as well as a fine-tuning resolution. Embodiments maintain a full 360° phase range while providing nth-bit least-significant bit (LSB) resolution across the entire range of possible phase shift and attenuation states, and compensate for the effect of frequency and/or PVT variations. In embodiments, two or more range partitionings can be defined that can be monotonic over respective sub-ranges while providing full coverage when combined. One such partitioning is a “coarse+fine” architecture. Embodiments of the coarse+fine architecture provide for greater than 360° of range for phase shifting and more than the total nominal design level for attenuation, and provide for fine ranges for both phase shifting and attenuation that are greater than the LSB of the corresponding coarse ranges for phase shifting and attenuation.
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