Threshold Compensated UHF Rectifier With Local Self-Calibrator

Date

2017-06-01

Author

Gharehbaghi, Kaveh
Zorlu, Ozge
Kocer, Fatih
Külah, Haluk

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This letter presents a threshold-compensated UHF rectifier with a local self-calibrator in a 0.18-mu m CMOS process. The self-calibrator compensates the intrinsic-V-th voltage for a broad range of input power intensity to decrease the sensitivity of the rectifier's power conversion efficiency (PCE) to the input power fluctuations. This makes the structure suitable for wireless charging applications, where efficient RF-to-DC conversion at different RF intensities is required. The proposed circuitry includes two auxiliary rectifiers and a dummy load. The output voltage of the first auxiliary rectifier generates the required positive compensation voltage for the main rectifier, while the second rectifier limits this voltage for large RF inputs. Thus, the efficiency drop due to the extra compensation voltage is avoided. Measurement results of the prototype at 433-MHz ISM band using various loads show almost constant PCE values over an incident power range of more than 10 dB. The measured maximum PCE is 34%, and the peak short-circuit current is 12 mu A at -17 dBm RF power.

Subject Keywords

Dickson rectifier, Low power calibration, RF energy harvesting, Threshold compensation technique

URI

https://hdl.handle.net/11511/47507

Journal

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS

DOI

https://doi.org/10.1109/lmwc.2017.2701326

Collections

Department of Electrical and Electronics Engineering, Article

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Citation Formats

K. Gharehbaghi, O. Zorlu, F. Kocer, and H. Külah, “Threshold Compensated UHF Rectifier With Local Self-Calibrator,” IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, pp. 575–577, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47507.