Data extraction threshold circuit and method
AssigneeTexas Instruments Incorporated
InventorRobert A. Neidorff
Life of this patent
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Abstract
A circuit for setting a threshold level for extracting data from a signal stream includes a terminal couplable to the signal stream. A peak detector is coupled to the terminal. A valley detector is coupled to the terminal. A comparator is coupled to outputs of the peak detector and the valley detector for generating a threshold voltage for extracting data or commands from the signal stream. A method of extracting data from a signal stream including: peak detecting the signal stream to generate a first signal; valley detecting the signal stream to generate a second signal; combining the first and second signals to generate a threshold signal; and extracting data from the signal stream utilizing the threshold level signal.
Claims13
A circuit extracting data from a signal stream comprising:
- a data stream terminal for receiving the signal stream;
- a peak detector having an input coupled to the data stream terminal and an output;
- a valley detector having an input coupled to the data stream terminal and an output coupled to the output of the peak detector at a node;
- a pre-amplifier having an input coupled to the node, an input connected to the data stream terminal, and an output;
- and
- a data comparator having a first input connected to the node, a second input connected to the output of the pre-amplifier, and a data output.
A method of extracting data from a signal stream comprising:
- peak detecting the signal stream to generate a first signal;
- valley detecting the signal stream to generate a second signal;
- combining the first and second signals to generate a threshold signal;
- receiving the signal stream at a first input terminal of a preamplifier;
- coupling a second input terminal of the preamplifier to the threshold signal;
- and
- comparing the output of the preamplifier to the threshold signal to extract data from the signal stream.
In a primary side wireless power transmitter for being inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the wireless power receiver, a primary side controller receiving communications from the secondary side wireless power receiver through the inductive coupling, comprising:
- a peak detector receiving a signal stream from the secondary side wireless power receiver and having a peak output coupled to a node;
- a valley detector receiving a signal stream from the secondary side wireless power receiver and having a valley output coupled to the node;
- a pre-amplifier having an input coupled to the node, an input connected to the signal stream, and an output;
- and
- a comparator having a first input coupled to the node, a second input coupled to the output of the pre-amplifier, and a data output.
A method of operating a primary side wireless power transmitter inductively coupled to a secondary side wireless power receiver for supplying power to the wireless power receiver to power a load coupled to the receiver comprising:
- peak detecting a signal stream from the wireless power receiver to generate a first signal;
- valley detecting the signal stream to generate a second signal;
- generating a threshold voltage signal from the first and second signals;
- receiving the signal stream at a first terminal of a preamplifier;
- coupling a second terminal of the preamplifier to the threshold voltage signal;
- and
- comparing the output of the preamplifier to the threshold signal to extract data from the signal stream.
Dependencies are inferred from the claim text.