Method and system for providing an activation signal based on a received RF signal
First Claim
1. An apparatus for providing an activation signal based on a received radio frequency (RF) signal, the apparatus comprising:
- an RF receiver configured to admit a received RF signal in a given frequency band;
a converter configured to convert the admitted RF signal to a proportional signal;
a low power comparator that has a first and second input and an output; and
a biasing and offset compensation circuit configured to bias the proportional signal higher by an offset midrange voltage and bias the second input to an offset compensated voltage based on an offset between the first and second input of the low power comparator,wherein the comparator is configured to receive the biased proportional signal at the first input and produce the activation signal at the output when a voltage difference between the biased proportional signal and the offset compensated voltage at the second input exceeds a comparison voltage threshold.
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Accused Products
Abstract
A method and apparatus are described for providing an activation signal based on a received radio frequency (RTF) signal. The apparatus includes an RF receiver configured to admit a received RF signal in a given frequency band and a converter configured to convert the admitted RF signal to a proportional signal. The apparatus also includes a low power comparator that has a first and second input and an output. A biasing and offset compensation circuit is configured to bias the proportional signal higher by an offset midrange voltage and bias the second input to an offset compensated voltage based on an offset between the inputs of the comparator. The comparator is configured to receive the biased proportional signal at the first input and produce the activation signal at the output when a voltage difference between the biased proportional signal and the offset compensated voltage exceeds a comparison voltage threshold.
38 Citations
20 Claims
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1. An apparatus for providing an activation signal based on a received radio frequency (RF) signal, the apparatus comprising:
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an RF receiver configured to admit a received RF signal in a given frequency band; a converter configured to convert the admitted RF signal to a proportional signal; a low power comparator that has a first and second input and an output; and a biasing and offset compensation circuit configured to bias the proportional signal higher by an offset midrange voltage and bias the second input to an offset compensated voltage based on an offset between the first and second input of the low power comparator, wherein the comparator is configured to receive the biased proportional signal at the first input and produce the activation signal at the output when a voltage difference between the biased proportional signal and the offset compensated voltage at the second input exceeds a comparison voltage threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for providing an activation signal based on a received RF signal, the method comprising:
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admitting a received RF signal in a given frequency band; converting the admitted RF signal to a proportional signal; biasing the proportional signal higher by an offset midrange voltage, the biased proportional signal being provided to a first input of a low power comparator; biasing a second input of the low power comparator to an offset compensated voltage based on an offset between the first and second input of the low power comparator, comparing the biased proportional signal to the offset compensated voltage; and producing an activation signal at an output of the low power comparator when a voltage difference between the biased proportional signal and the offset compensated voltage exceeds a comparison voltage threshold.
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19. An apparatus for providing an activation signal based on a received RF signal, the apparatus comprising:
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means for admitting a received RF signal in a given frequency band; means for converting the admitted RF signal to a proportional signal; means for biasing the proportional signal higher by an offset midrange voltage, the biased proportional signal being provided to a first input of a low power comparator; means for biasing a second input of the low power comparator to an offset compensated voltage based on an offset between the first and second input of the low power comparator, means for comparing the biased proportional signal to the offset compensated voltage; and means for producing an activation signal at an output of the low power comparator when a voltage difference between the biased proportional signal and the offset compensated voltage exceeds a comparison voltage threshold.
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20. An apparatus for providing an activation signal based on a received RF signal, the apparatus comprising:
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an RF receiver configured to admit a received RF signal in a given frequency band; a converter configured to convert the admitted RF signal to a proportional signal; a low power comparator that has a first and second input and an output; and a biasing and offset compensation circuit configured to bias the proportional signal higher by approximately 5.1 mV and bias the second input to an offset compensated voltage based on an offset between the first and second input of the low power comparator, wherein the comparator is configured to receive the biased proportional signal at the first input and produce the activation signal at the output when a voltage difference between the biased proportional signal and the offset compensated voltage at the second input exceeds 250 μ
V.
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Specification