Demodulation of on-off-key modulated signals in signal isolator systems
First Claim
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1. An on-off key (“
- OOK”
) receiver system, comprising;
an isolator having a first side and a second side;
a receiver, coupled to the second side of the isolator, configured to, responsive to an OOK voltage input signal, generate a current signal based on the input signal, the current signal comprising a first current level when the input signal has a first OOK state and a second current level different than the first current level when the input signal has a second OOK state different than the first OOK state, andan output driver configured to generate a voltage representation of the current signal.
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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.
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Citations
25 Claims
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1. An on-off key (“
- OOK”
) receiver system, comprising;an isolator having a first side and a second side; a receiver, coupled to the second side of the isolator, configured to, responsive to an OOK voltage input signal, generate a current signal based on the input signal, the current signal comprising a first current level when the input signal has a first OOK state and a second current level different than the first current level when the input signal has a second OOK state different than the first OOK state, and an output driver configured to generate a voltage representation of the current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- OOK”
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9. 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 of the pair of current sources, the current routers having a first conductivity pathway and a second conductivity pathway of lower conductivity than the first conductivity pathway, the first conductivity pathway of a first current router and the second conductivity pathway of a second current router having control inputs coupled to a first differential signal representing an OOK input signal and the first conductivity pathway of the second current router and the second 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 a current signal representing an aggregate amount of current passing through second conductivity pathways of the current routers; and an output driver to generate a voltage representation of the current signal. - View Dependent Claims (10, 11, 12, 13, 14, 15)
- OOK”
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16. 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 than the transistors of the second two differential pair circuits, wherein a larger transistor of each differential pair circuit is coupled to a second leg a first current mirror of the pair of current mirrors, and a smaller transistor of each differential pair circuit is coupled to a second leg of a second current mirror of the pair of current mirrors; and an output driver to generate an output voltage based on a current present at the intermediate output node. - View Dependent Claims (17, 18, 19, 20, 21)
- OOK”
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22. A method of generating a digital voltage signal representing a differential on-off keyed input signal, comprising:
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generating a current signal from an on-off key (OOK) signal received by an isolator device, comparing the current signal to a reference current signal, and generating a binary voltage signal having a value dependent on a result of the comparison of the current signal to the reference current signal. - View Dependent Claims (23, 24, 25)
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Specification