Programmable chip design for radio frequency signal generation and method therefor
A radio frequency identification (RFID) method, reader and circuit for generating RFID command signals. The reader and circuit include at least one command register, the at least one command register storing at least one command bit, the at least one command register storing at least one command bit, the at least one command bit corresponding to a portion of a command to be transmitted to at least one remote communication device, at least one table, the at least one table storing wave-shaping transition values for shaping the at least one command bit prior to transmission, and at least one control register, the at least one control register storing at least one configuration value.
1 . A radio frequency identification (RFID) circuit for generating RFID command signals, the circuit comprising:
at least one command register, the at least one command register storing at least one command bit, the at least one command bit corresponding to a portion of a command to be transmitted to at least one remote communication device;
at least one table, the at least one table storing wave-shaping transition values for shaping the at least one command bit; and
at least one control register, the at least one control register storing at least one configuration value for shaping the at least one command bit.
2 . The device of claim 1 , wherein the circuit is a programmable logic device.
3 . The device of claim 2 , wherein the programmable logic device is a field programmable gate array.
4 . The device of claim 1 , wherein the at least one configuration value is a time duration value, time duration value specifying the amount of time that a bit 0 remains at a high state before transitioning to a low state.
5 . The device of claim 1 , wherein the at least one configuration value is a duty cycle value specifying the ratio of the time that a bit is in a high state to the time that the bit is in a low state.
6 . The device of claim 1 , wherein the at least one configuration value is a number of transition steps value.
7 . The device of claim 1 , wherein the at least one configuration value is a pulse width high period value.
8 . The device of claim 1 , wherein the at least one configuration value is a pulse width low period value.
9 . A method for using an RFID reader to generate command signals for transmission to at least one remote communication device, the method comprising:
storing at least one wave-shaping transition value, the at least one wave-shaping transition value used to shape at least one command bit of the command signal for transmission of the at least one command bit to the at least one remote communication device; and
storing at least one configuration value, the at least one configuration value defining timing characteristics of the at least one command bit of the command signal for transmission of the at least one command bit to the at least one remote communication device.
10 . The method of claim 9 , wherein the at least one configuration value is a time duration value, time duration value specifying the amount of time that a bit 0 remains at a high state before transitioning to a low state.
11 . The method of claim 9 , wherein the at least one configuration value is a duty cycle value specifying the ratio of the time that a bit is in a high state to the time that the bit is in a low state.
12 . The method of claim 9 , wherein the at least one configuration value is a number of transition steps value.
13 . The method of claim 9 , wherein the at least one configuration value is a pulse width high period value.
14 . The method of claim 9 , wherein the at least one configuration value is a pulse width low period value.
15 . The method of claim 9 , wherein the at least one configuration value is a pulse width high period value.
16 . A radio frequency identification (RFID) reader for use in an RFID system, the reader comprising:
a radio frequency (RF) module, the radio frequency module including an RF source for synthesizing RF signals, and a transceiver for transmitting RF signals to at least one remote communication device and receiving RF signals from the at least one remote communication device; and
a controller, the controller including a digital signal processor and a signal generation circuit, the circuit including:
at least one command register, the at least one command register storing at least one command bit, the at least one command bit corresponding to a portion of a command, the command for transmission to at least one remote communication device;
at least one table, the at least one table storing wave-shaping transition values for shaping the at least one command bit; and
at least one control register, the at least one control register storing at least one configuration value for shaping the at least one command bit.
17 . The reader of claim 16 , wherein the at least one configuration value is a time duration value, time duration value specifying the amount of time that a bit 0 remains at a high state before transitioning to a low state.
18 . The reader of claim 16 , wherein the at least one configuration value is a duty cycle value specifying the ratio of the time that a bit is in a high state to the time that the bit is in a low state.
19 . The reader of claim 16 , wherein the at least one configuration value is a number of transition steps value, the number of transition steps value identifying the number of steps to be made by a digital-to-analog converter during a transition from a first state to a second state.
20 . The reader of claim 16 , wherein the at least one configuration value is a pulse width high period value.