CHR2244-QDG(2009) Ver la hoja de datos (PDF) - United Monolithic Semiconductors

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componentes Descripción

Fabricante

CHR2244-QDG
(Rev.:2009)

5.8 GHz One Antenna Reflective Transponder for Tag

United Monolithic Semiconductors 

CHR2244-QDG

5.8 GHz One Antenna Reflective Tag

Application Information

General Transmission system

The transmission system is described as following, the tag doesn’t generate any frequency:

DOWNLINK BEACON

figure 1a

TRANSMIT

MODE

Fo

F-AM

TAG

RECEIVE

MODE

UPLINK

figure 1b

Fo

BEACON

RECEIVE

MODE

TAG

Fo

TRANSMIT

MODE

Fm

Figure 1: Transmission system operating principle

Two modes of communication are implemented

From beacon to tag (figure 1a): the beacon is in transmit mode while the tag is in the receive mode.

The beacon sends an Amplitude Modulated (AM) RF signal to the tag. In figure 1a, F-AM is the

amplitude modulation frequency and F0 is the carrier.

From tag to beacon (figure 1b): the beacon is in receive mode while the tag is in transmit mode. The

beacon sends a continuous wave (CW) RF signal to the tag, this signal is then mixed (at tag level) with

the MOD input signal (Fm) thanks to a reflective mixer. The reflected signal is sent back to the beacon

and is demodulated thanks to an homodyne receiver.

Ref. : DSCHR2244-QDG9030 - 30 Jan 09

10/14

Specifications subject to change without notice

Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE

Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09

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