Battery activation circuit

A circuit for activating a device, comprising:

• an interrupt circuit for determining whether an interrupt period of a received signal matches a predetermined plurality of values or falls within a predetermined range, the interrupt circuit outputting an interrupt signal if the interrupt period matches the predetermined value or fails within the predetermined range;
• and
• a data slicer for comparing a received activate code to a stored value, the data slicer sending a wake up signal for activating the device if the received activate code matches the stored value,
• wherein the interrupt circuit includes:
• a first pair of mirror inverters, each inverter being tuned for a different specified delay timing, the first pair of mirror inverters detecting whether a low period of an interrupt pulse is between the specified delay timings;
• a second pair of mirror inverters, each inverter being tuned for a different specified delay timing, the second pair of mirror inverters detecting whether a high period of the interrupt pulse is between the specified delay timings;
• a first latch sampling and storing output from the first pair of mirror inverters;
• a second latch sampling and storing output from the second pair of mirror inverters;
• a third latch sampling and storing output from the first latch;
• and
• a logic gate receiving output from the second latch and output from the third latch,
• wherein output from the logic gate is the interrupt signal.

A circuit for activating a device, comprising:

• an interrupt circuit for determining whether an interrupt period of a received signal matches a predetermined plurality of values or falls within a predetermined range, the interrupt circuit outputting an interrupt signal if the interrupt period matches the predetermined value or falls within the predetermined range;
• and
• a data slicer for comparing a received activate code to a stored value, the data slicer sending a wake up signal for activating the device if the received activate code matches the stored value,
• wherein the logic gate also receives output from a feedback latch storing a value associated with the interrupt pulses,
• wherein the circuit is implemented in a radio frequency identification (RFID) tag,
• wherein the received signal is an activate command having a preamplifer centering sequence, the interrupt period, and the activate code.

A circuit for activating a device, comprising:

• an interrupt circuit for determining whether an interrupt period of a received signal matches a predetermined plurality of values or falls within a predetermined range, the interrupt circuit outputting an interrupt signal if the interrupt period matches the predetermined value or falls within the predetermined range;
• and
• a data slicer for comparing a received activate code to a stored value, the data slicer sending a wake up signal for activating the device if the received activate code matches the stored value;
• and
• an adaptive timing circuit for enabling and adjusting a clock for subsequent processing, wherein an output value of the adaptive timing circuit is stored in a latch, wherein the adaptive timing circuit is powered down upon storing the output value of the adaptive timing circuit in the latch.

A circuit for activating a device, comprising:

• an interrupt circuit for determining whether an interrupt period of a received signal matches a predetermined plurality of values or falls within a predetermined range, the interrupt circuit outputting an interrupt signal if the interrupt period matches the predetermined value or falls within the predetermined range;
• and
• a data slicer for comparing a received activate code to a stored value, the data slicer sending a wake up signal for activating the device if the received activate code matches the stored value,
• wherein the received signal is an activate command having a preamplifer centering sequence, the interrupt period, and the activate code.

A circuit for activating a device, comprising:

• an interrupt circuit for determining whether an interrupt period portion of a received signal matches a predetermined plurality of values or falls within a predetermined range, the interrupt circuit outputting an interrupt signal if the interrupt period portion of the received signal matches the predetermined value or falls within the predetermined range;
• an adaptive timing circuit receiving the interrupt signal from the interrupt circuit, and in response to the interrupt signal, the adaptive timing circuit enabling and adjusting a clock for subsequent processing;
• and
• a calibrator for tuning the adaptive timing circuit,
• wherein the circuit is implemented in a radio frequencv identification (RFID) tag,
• wherein the received signal is an activate command having a preamplifer centering sequence, the interrupt period, and the activate code.

A circuit for identifing an interrupt, comprising:

• a first pair of mirror inverters, each inverter being tuned for a different specified delay timing, the first pair of mirror inverters detecting whether a low period of an interrupt pulse is between the specified delay timings;
• a second pair of mirror inverters, each inverter being tuned for a different specified delay timing, the second pair of mirror inverters detecting whether a high period of the interrupt pulse is between the specified delay timings;
• a first latch sampling and storing output from the first pair of mirror inverters;
• a second latch sampling and storing output from the second pair of mirror inverters;
• a third latch sampling and storing output from the first latch;
• and
• a logic gate receiving output from the second latch and output from the third latch,
• wherein output from the logic gate is indicative of a successful identification of an interrupt.

A method for activating a device, comprising:

• listening for an activate command at a device;
• receiving the activate command, the activate command including a preamplifier centering sequence, an interrupt period, and an activate code;
• analyzing the activate code if the interrupt period matches a predetermined value or falls within a predetermined range;
• and
• activating the device if the activate code matches a value stored in the device.

A method for activating a device, comprising:

• listening for an activate command at a device;
• receiving the activate command, the activate command including a preamplifer centering sequence, an interrupt period, and an activate code;
• analyzing the activate code if the interrupt period matches a predetermined value or falls within a predetermined range;
• and
• activating the device if the activate code matches a value stored in the device,
• wherein an interrupt circuit is used to determine whether the interrupt period matches the predetermined value or falls within the predetermined range, the interrupt circuit comprising:
• a first pair of mirror inverters, each inverter being tuned for a different specified delay timing, the first pair of mirror inverters detecting whether a low period of an interrupt pulse is between the specified delay timings;
• a second pair of mirror inverters, each inverter being tuned for a different specified delay timing, the second pair of mirror inverters detecting whether a high period of the interrupt pulse is between the specified delay timings;
• a first latch sampling and storing output from the first pair of mirror inverters;
• a second latch sampling and storing output from the second pair of mirror inverters;
• a third latch sampling and storing output from the first latch;
• and
• a logic gate receiving output from the second latch and output from the third latch,
• wherein output from the logic gate is the interrupt signal.

A method for activating a device using an activate code, comprising:

• receiving an activate code at a device;
• comparing the activate code to a prestored value;
• activating the device if the activate code matches the prestored value;
• and
• not activating the device if the activate code does not match the prestored value,
• wherein one particular activate code bypasses the activate circuit.

A method for activating a device using an activate code, comprising:

• receiving an activate code at a device;
• comparing the activate code to a prestored value;
• activating the device if the activate code matches the prestored value;
• and
• not activating the device if the activate code does not match the prestored value,
• wherein the activate code is part of an activate command, the activate command further including a preamplifer centering sequence and an interrupt period, the activate code not being compared to the prestored value unless the interrupt period falls within a prespecified range.

A method for activating a device using an activate code, comprising:

• receiving a string of symbols;
• attempting to recognize a symbol or combination of symbols as a predefined interrupt;
• if an interrupt is recognized, comparing a sequence of symbols received subsequent to a recognized interrupt to a prestored value;
• activating at least a portion of the device if the sequence of symbols received subsequent to the interrupt matches the prestored value;
• and
• not activating the at least a portion the device if the sequence of symbols received subsequent to the interrupt do not match the prestored value.

A method for activating a plurality of selected devices, comprising:

• sending multiple different activate commands to remote devices, each remote device analyzing the activate commands to determine whether one of the activate commands includes an activate code matching a value stored on the particular device;
• and
• activating the device if one of the activate codes matches a value stored in the device
• wherein the activate command includes a preamplifer centering sequence, an interrupt period, and an activate code.