RFID Detector for 13.56Mhz

This project describes a sensitive detector that will equally faithfully produce a sound in response to pulses picked up from an 13.56MHz RFID tag transmitter. The system is extremely simple and contains two IC¿s, the central part of the circuit is an SA615N, is a high performance monolithic low-power FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, a quadrature detector, muting, logarithmic received signal strength indicator (RSSI) and voltage regulator. The other IC is a power supply consisting mainly of a low-drop regulator LP2951 whose low-battery indicator signal is used to light an LED when the battery voltage drops below about 6V. The RFID was designed with Orcad Release 9.1, I did the scheme of the project with the Capture CIS and after for do the board I use Layout Plus.