Spread spectrum isolator
First Claim
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1. An apparatus for transmitting a logical data value from a first die to a second die, comprising:
- functional circuitry on the first die, said functional circuitry configured to drive an RF voltage isolation link connecting the first die with the second die with an RF signal responsive to receipt of a logic signal at a first logic state; and
control circuitry for modifying the frequency of the RF signal transmitted over the RF voltage isolation link to spread harmonics to other than a fundamental frequency.
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Abstract
An apparatus comprising a functional circuitry on a first die. Said function circuitry configured to drive an RF voltage isolation link with an RF signal responsive to receipt of a logic signal at a first logic state. Control circuitry modifies the frequency of the RF signal to spread harmonics to other than a fundamental frequency.
197 Citations
17 Claims
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1. An apparatus for transmitting a logical data value from a first die to a second die, comprising:
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functional circuitry on the first die, said functional circuitry configured to drive an RF voltage isolation link connecting the first die with the second die with an RF signal responsive to receipt of a logic signal at a first logic state; and control circuitry for modifying the frequency of the RF signal transmitted over the RF voltage isolation link to spread harmonics to other than a fundamental frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing on RF voltage isolation link for transmitting a logical data value from a first die to a second die, comprising the steps of:
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driving the RF voltage isolation link with a transmitted RF signal responsive to the receipt of a logic signal in a first logic state; and modifying the frequency of the RF signal transmitted on the RF isolation link to spread harmonics to other than a fundamental frequency. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An apparatus, comprising:
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functional circuitry on the first die, said functional circuitry configured to drive an RF voltage isolation link connecting the first die with the second die with an RF signal responsive to receipt of a logic signal at a first logic state; and control circuitry for modifying the frequency of the RF signal transmitted over the RF voltage isolation link to spread harmonics to other than a fundamental frequency, wherein the control circuitry further comprises; a slow ring oscillator; a divider circuit for providing a clock signal responsive to an output of the slow ring oscillator; a shift register for providing a plurality of output bits responsive to the clock signal and a data signal; logic circuitry for generating the data signal responsive to a first portion of the plurality of output bits; wherein a randomly generated control code comprises a second portion of the plurality of output bits; and an LC oscillator circuit responsive to the randomly generated control code for generating the RF carrier signal, wherein the randomly generated control code causes the generation of one of a plurality of frequencies, at least two of which comprise a first and second frequencies.
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Specification