A frequency counter based analog-to-digital converter for a RFID telemetry system

This paper describes a method for determining a digital representation of a value for a remote sensing element using a novel and lower power method of analog to digital conversion. This conversion process is most effective for low-frequency, radio frequency identification (RFID) sensing systems wher...

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Main Authors: McCoy, M.C., Isert, C., Jackson, D., Naber, J.
Format: Conference Proceeding
Language:English
Subjects:
Analog-digital conversion
Application specific integrated circuits
Counting circuits
Frequency conversion
Oscillators
Radiofrequency identification
Remote sensing
RF signals
Signal processing
Telemetry
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creator McCoy, M.C.
Isert, C.
Jackson, D.
Naber, J.
description This paper describes a method for determining a digital representation of a value for a remote sensing element using a novel and lower power method of analog to digital conversion. This conversion process is most effective for low-frequency, radio frequency identification (RFID) sensing systems where the sensing element tags are powered by an inductively coupled carrier signal of fixed frequency. The method uses a specially gated frequency counter to create a digital value that is related to the system's carrier frequency and the frequency of variable oscillator used with the sensing element. This conversion method is highly scalable while maintaining a low current consumption. One configuration yields four bits of resolution with a conversion time of 1.34 ms and a current consumption of 30 muA. The ASIC was fabricated on a 1.5 mum CMOS process from AMI Semiconductor.
doi_str_mv 10.1109/MWSCAS.2007.4488806
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source IEEE Xplore All Conference Series
subjects Analog-digital conversion
Application specific integrated circuits
Counting circuits
Frequency conversion
Oscillators
Radiofrequency identification
Remote sensing
RF signals
Signal processing
Telemetry
title A frequency counter based analog-to-digital converter for a RFID telemetry system
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