Patent · US Active

High dynamic range ASK demodulator for use in an RFID transponder

US7855595B2 · kind B2 · utility

1Cited by

1References

6Claims

0Family size

Assignee

TEXAS INSTRUMENTS DEUTSCHLAND GMBH · DE

Inventors

Oliver Nehrig · Freising, DE
Carlo Peschke · Kirchheim unter Teck, DE
Ernst Muellner · Munich, DE
Adolf Baumann · Ilsenburg, DE
Jens Graul · Freising, DE

Key dates

Filing date	Jul 30, 2008
Grant date	Dec 21, 2010
Priority date	—
Expiry date	Mar 6, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH03K5/082
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An ASK demodulator for use in an RFID transponder having a limiter circuit associated with the antenna circuit and converting the ASK antenna field strength modulation into an ASK limiter current modulation by limiting the antenna voltage to a fixed value and thereby causing the limiter current to be substantially proportional to the ASK antenna field strength, and a current discriminator circuit that discriminates the ASK limiter current modulation. By converting the field strength modulation into a proportional limiter current and discriminating that limiter current, a linear relationship and a stable demodulator sensitivity are achieved. The current discrimination can be made accurately under low-voltage conditions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.