Low power transponder circuit
First Claim
1. A transponder circuit comprising an input signal section coupled to both a first and a second comparator.
2 Assignments
0 Petitions
Accused Products
Abstract
A low power transponder circuit comprises two comparators coupled to a signal input section, wherein only a first comparator is active before a valid wake-up signal is detected and validated. The first comparator preferably consumes less power than the second comparator, and the second comparator preferably operates at a higher speed than the first comparator, such that valid received signal processing is performed on a signal from the second, higher speed comparator. Reference voltage levels for the two comparators can also be modified during circuit operation with either information stored in the transponder or by data received in a valid received signal.
24 Citations
27 Claims
- 1. A transponder circuit comprising an input signal section coupled to both a first and a second comparator.
- 11. A method of reducing power consumption in a transponder circuit, comprising activating a first comparator prior to receiving a predefined signal, and activating a second comparator in response to an output from said first comparator.
- 15. A method of operating a transponder circuit, comprising routing an input signal to a first comparator which is enabled and a second comparator which is disabled, and enabling said second comparator in response to a signal output by said first comparator.
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22. A transponder circuit, comprising:
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an input terminal;
a first comparator, coupled to said input terminal;
a second comparator, coupled to said input terminal;
control circuitry, coupled to said first comparator and said second comparator, configured to control the operation of said second comparator by determining a validity status of a signal received from said first comparator.
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- 25. A method of making a transponder circuit, comprising coupling an antenna to two separate comparators.
Specification