# US 8,543,163 B2 · Signal enhancer chip for radio frequency identification system and a signal enhancer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,163 B2 - Document ID: US8543163B2 - Status: Granted - Kind: B2 - Application number: 12/937,438 - Filed: 2009-04-17 - Published: 2011-02-17 - Granted: 2013-09-24 - Earliest claimed: 2008-04-18 - Assignees: Shanghai Quanray Electronics Co., Ltd - Applicants: Kewei Jin - Inventors: Kewei Jin - Web page: https://patentgrep.com/patent/US8543163B2 ## CPC - G06K 19/0723: {the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs} - G06K 7/0008: {General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer} - G06K 7/10178: {including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field (comparable booster antennas integrated on the record carrier itself G06K19/07794)} - G06K 19/07771: {the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object} - G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS ## Abstract A signal enhancer chip for a radio frequency identification system and a signal enhancer are disclosed. The signal enhancer chip includes: a receiving circuit, a sending circuit and a power supply module. The receiving circuit comprises a demodulation amplification module and a digital quantizing module. The sending circuit comprises a logic control module and a modulation module. The demodulation amplification module is for amplifying and demodulating the received communication signal sent by a dual interface SIM card. The digital quantizing module converts an analog communication signal output from the demodulation amplification module to the digital communication signal. The logic control module processes the digital communication signal output from the digital quantizing module and generates a subsidiary carrier wave signal necessary for returning to a reader. The modulation module generates a communication signal to be sent according to the subsidiary carrier wave signal. The signal enhancer and chip, as the trunk device between the dual interface SIM card and the reader, can enhance the acknowledge signal of the dual interface SIM card and ensure the normal communication between the dual interface SIM card and the reader. ## Claims ### Claim 1 A signal enhancer chip for a radio frequency identification system, comprising: a receiving circuit comprising a demodulation amplification module for amplifying and demodulating communication signals received from a dual interface SIM card, and then outputting an analog communication signal, and a digital quantizing module for converting the analog communication signal to a digital communication signal; a sending circuit comprising a logic control module for processing the digital communication signal received from the digital quantizing module and generating a subsidiary carrier wave signal necessary for returning to a reader, and a modulation module for generating a communication signal to be sent according to the subsidiary carrier wave signal; a power supply module; and a filter for filtering the communication signals received from the dual interface SIM card, and then outputting the communication signals to the demodulation amplification module; wherein the filter comprises: a band-pass filter for filtering modulation wave signals and carrier wave signals received from the dual interface SIM card; and a band-stop filter for filtering modulation wave signals and carrier wave signals sent from the reader; wherein the central frequency of the band-pass filter and the band-stop filter is the same with the frequency of the carrier wave signals sent from a signal enhancer or from the reader. ### Claim 2 (depends on 1) The signal enhancer chip according to claim 1, wherein the demodulation amplification module further comprises: a demodulation circuit for demodulating communication signals received from the dual interface SIM card; and an amplifier circuit for amplifying communication signals which has been demodulated by the demodulation circuit. ### Claim 3 (depends on 2) The signal enhancer chip according to claim 2, wherein the demodulation circuit performs a coherent demodulation or a non-coherent demodulation. ### Claim 4 (depends on 3) The signal enhancer chip according to claim 3, wherein the non-coherent demodulation is a diode peak envelope demodulation or an average envelope demodulation. ### Claim 5 (depends on 1) The signal enhancer chip according to claim 1, wherein the digital quantizing module is an analog-digital converter or a comparator. ### Claim 6 (depends on 1) The signal enhancer chip according to claim 1, wherein the modulation module comprises a control switch, when the control switch being activated, a load current being formed, and a subsidiary carrier modulation signal being generated and returned to the reader. ### Claim 7 (depends on 6) The signal enhancer chip according to claim 6, wherein the control switch is an insulated gate field effect transistor. ### Claim 8 (depends on 1) The signal enhancer chip according to claim 1, wherein the modulation module performs a reflex modulation or a load modulation. ### Claim 9 (depends on 1) The signal enhancer chip according to claim 1, wherein the power supply module comprises a bridge rectifier circuit. ### Claim 10 (depends on 1) A signal enhancer comprises a signal enhancer chip with reference to claim 1.