Title: Feedback modulating circuit
Application Number: 02111821 Application Date: 2002.05.24
Publication Number: 1459986 Publication Date: 2003.12.03
Approval Pub. Date: Granted Pub. Date: 2005.09.07
International Classifi-cation: H04Q7/30,H04B1/04,H03C7/00
Applicant(s) Name: Shanghai Beiling Co., Ltd. Address: 200233
Inventor(s) Name:
Attorney & Agent: chen liang
Abstract:
     A feedback modulation circuit for increasing the card reading distance by 1.5-2 times is composed of a resonant circuit consisting of resonant capacitor and resonant antenna for obtaining energy and clock and data signals from RF field of base station and transmitting data signals to base station, a rectifying bridge serially connected with said resonant circuit and consisting of 4 rectifying diodes, and a modulating PMOS transistor for modulating the load by data signals when data is transmitted to base station. Its advantages are simple circuit, and high modulating coefficient.
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