Multiplexed RF isolator
First Claim
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1. An integrated circuit isolator providing for communications of multiple digital data signals over a common communications channel across a voltage isolation barrier, comprising:
- an integrated circuit package having a plurality of input pins for receiving respective ones of a plurality of input digital data signals and a plurality of output pins for outputting a plurality of respective output digital data signals;
a transformer disposed between the input and output pins to provide the voltage isolation barrier within the package between the plurality of input pins and the plurality of output pins and for passing the input digital signals between the plurality of input pins and the plurality of output pins over the common communications channel, wherein the voltage isolation barrier provides voltage isolation of up to 5000 volts;
a time multiplexer to time multiplex the input digital data signals and transmit the time multiplexed input digital data signals across the transformer from one side thereof; and
a time demultiplexer for receiving from the transformer on an other side thereof, and voltage isolated from the one side thereof, the multiplexed input digital data signals and demultiplexing the received multiplexed input digital data signals as a reconstructed sample of the respective output digital data signals and a latch for latching the reconstructed sample onto the respective one of the plurality of output pins.
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Abstract
A system for providing multiple communication channels over a single voltage isolation link includes first circuitry for multiplexing a plurality of digital data inputs from a plurality of communication channels onto the single voltage isolation link. Second circuitry de-multiplexes the plurality of digital data inputs from the single voltage isolation link to the plurality of communication channels. An RF isolator is used for providing the single voltage isolation link.
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Citations
22 Claims
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1. An integrated circuit isolator providing for communications of multiple digital data signals over a common communications channel across a voltage isolation barrier, comprising:
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an integrated circuit package having a plurality of input pins for receiving respective ones of a plurality of input digital data signals and a plurality of output pins for outputting a plurality of respective output digital data signals; a transformer disposed between the input and output pins to provide the voltage isolation barrier within the package between the plurality of input pins and the plurality of output pins and for passing the input digital signals between the plurality of input pins and the plurality of output pins over the common communications channel, wherein the voltage isolation barrier provides voltage isolation of up to 5000 volts; a time multiplexer to time multiplex the input digital data signals and transmit the time multiplexed input digital data signals across the transformer from one side thereof; and a time demultiplexer for receiving from the transformer on an other side thereof, and voltage isolated from the one side thereof, the multiplexed input digital data signals and demultiplexing the received multiplexed input digital data signals as a reconstructed sample of the respective output digital data signals and a latch for latching the reconstructed sample onto the respective one of the plurality of output pins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An integrated circuit isolator providing for communications of multiple digital data signals over a common communications channel across a voltage isolation barrier, comprising:
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an integrated circuit package having a plurality of input pins for receiving respective ones of a plurality of input digital data signals on one side of the isolation barrier and a plurality of output pins for outputting a plurality of respective output digital data signals on the other side of the isolation barrier; first circuitry disposed within the package and on the one side of the isolation barrier and including; a sampling circuit for sampling select ones of the input digital data signals during a given time slot at a sampling rate defined by a sample clock; a framer circuit for encoding the sampled data for serial transmission on the common communications channel; the sampling circuit including a latching shift register for receiving each of the plurality of digital data input signals in parallel, the latching shift register latching a value on each of the plurality of input digital data signals to a present data value responsive to a first control input, the latching shift register further serially shifting the latched present data value of each of the plurality of input digital data signals from the latching shift register to the framer circuit responsive to the sampling clock on a clock signal input; a multiplexer for multiplexing each of the plurality of input digital data signals received on the plurality of input pins, and a transmitter for transmitting to a common communications channel transmit output on the one side of the isolation barrier the multiplexed input digital data signals; second circuitry disposed within the package and on the other side of the isolation barrier and including; a receiver for receiving from a common communications channel receive input on the other side of the isolation barrier the multiplexed input digital data signals, and a demultiplexer for demultiplexing the received multiplexed input digital data signals to provide the plurality of output digital data signals for interface to the plurality of output pins; and a communications interface for connecting the common communications channel transmit output to the common communications receive input across the isolation barrier to form the common communications channel, such that voltage isolation is maintained between the first and second circuitry within the package. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for providing multiple communications channels over a single voltage isolation link, comprising:
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a framer circuit for Manchester encoding data for serial transmission on the single voltage isolation link, wherein the framer circuit further generates a start bit to indicate a beginning of a frame responsive to a second control signal and a stop bit indicating an end of frame responsive to a third control signal; a latching shift register for receiving each of a plurality of digital data inputs from a plurality of communications channels in parallel, the latching shift register latching a value on each of the plurality of digital data inputs to a present data value responsive to a first control input, the latching shift register further serially shifting the latched present data value of each of the plurality of digital data inputs from the latching shift register to the framer circuit responsive to a clock signal input; a synchronizer circuit for Manchester decoding data serially received from the single voltage isolation link into clock data and the present data values responsive to detection of the start bit and for generating a write enable signal responsive to detection of the stop bit; a shift register for serially receiving the clock data and the present data values and for outputting the received present data values in parallel; an output register for storing the present data values received in parallel from the shift register responsive to the write enable control signal; and an RF isolator for providing the single voltage isolation link. - View Dependent Claims (20, 21, 22)
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Specification