Demodulation of on-off-key modulated signals in signal isolator systems
AssigneeAnalog Devices, Inc.
InventorsRuida Yun, Eric C. Gaalaas, Baoxing Chen
Life of this patent
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Abstract
A receiver system for an on-off key (“OOK”) isolator system may include a receiver that generates an intermediate current signal based on an OOK input signal. The intermediate current may be provided at a first current level when the input signal has a first OOK state and a second current level when the input signal has a second OOK state. The system also may include an output driver to generate a voltage representation of the intermediate current signal. Performing signal processing in a current domain permits fast transitions between OOK states.
Claims25
An on-off key (“OOK”) receiver system, comprising:
- a receiver that, responsive to an OOK input signal, generates an intermediate current signal based on the input signal, the intermediate signal comprising a first current level when the input signal has a first OOK state and a second current level when the input signal has a second OOK state, and
- an output driver to generate a voltage representation of the intermediate current signal.
An on-off key (“OOK”) receiver system, comprising:
- a pair of current sources,
- a pair of current routers, each coupled to a respective current source, the current routers having a high conductivity pathway and a low conductivity pathway, the high conductivity pathway of a first current router and the low conductivity pathway of a second current router having control inputs coupled to a first differential signal representing an OOK input signal and the high conductivity pathway of the second current router and the low conductivity pathway of the first current router having control inputs coupled to a second differential signal representing the OOK input signal,
- a current output system to generate an intermediate current signal represent an aggregate amount of current passing through low conductivity pathways of the current routers;
- and
- an output driver to generate a voltage representation of the intermediate current signal.
An on-off key (“OOK”) receiver system, comprising:
- a pair of current mirrors, each having first and second legs, first legs of the two current mirrors coupled to an intermediate output node;
- four differential pair circuits, each comprising a pair of mismatched transistors coupled to a respective current source, the transistors of the first two differential pair circuits having a different doping type and the transistors of the second two differential pair circuits, wherein
- a larger transistor of each differential pair circuit is coupled to a second leg the first current mirror, and
- a smaller transistor of each differential pair circuit is coupled to a second leg of the second current mirror;
- and
- an output driver to generate an output voltage based on a current present at the intermediate output node.
A method of generating a digital voltage signal representing a differential on-off keyed input signal, comprising:
- generating a rectified current signal from an OOK signal received by an isolator device,
- comparing the rectified current signal to a reference current signal, and
- generating a binary voltage signal from the current comparison.
Dependencies are inferred from the claim text.