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A new transponder architecture with on-chip ADC for long-range telemetry applications

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2 Author(s)
Kocer, F. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Flynn, M.P.

We present a new architecture for wireless power and data telemetry that recovers power and a system clock from a weak incident RF signal. A high-efficiency RF-DC converter generates a 3-VDC supply for the system from a -12.3-dBm incident RF signal, gathered by a commercial 50-Ω antenna. A system clock is extracted from the same incident signal, by an injection-locked LC oscillator. Sub-harmonic injection-locking facilitates the separation of the incident and the transmit signal frequencies, without need for a PLL. The proposed architecture is used in a long-range telemetry device, incorporating an on-chip ADC, and employing active telemetry for data transmission. Data is transmitted through binary phase-shift-keying of a 900-MHz carrier. The prototype, implemented in 0.25-μm CMOS, occupies less than 1 mm2. A wireless operation range of more than 18 meters is indicated by anechoic chamber testing.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:41 ,  Issue: 5 )

Date of Publication:

May 2006

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