Reduced frequency backwards clock for isolated sigma-delta modulators
First Claim
1. A system comprising:
- a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value;
an optical link coupled with the divider for receiving the divided clock signal and transmitting the divided clock signal from the first side of the electrically isolated circuitry to a second side of the electrically isolated circuitry; and
phase-locked loop circuitry on the second side of the electrically isolated circuitry, the phase-locked loop circuitry coupled with the optical link and configured to receive the divided clock signal from the optical link and generate a second signal at a multiple of a characteristic frequency of the divided clock signal so that the second signal comprises the characteristic frequency of the clock signal received by the divider circuitry, wherein the phase-locked loop circuitry is disposed on a first integrated circuit chip, the optical link is disposed on a second integrated circuit chip, and the divider is disposed on a third integrated circuit chip, the phase-locked loop circuitry including a phase detector and filter and a voltage controlled oscillator, the voltage controlled oscillator directly coupled to a sigma-delta modulator, the voltage controlled oscillator supplying the second signal to the sigma-delta modulator and a divided feedback signal to the phase detector and filter.
1 Assignment
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Accused Products
Abstract
A system includes a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value. The system also includes an optical link coupled with the divider for receiving the divided clock signal and transmitting the divided clock signal from the first side of the electrically isolated circuitry to a second side of the electrically isolated circuitry. The system further includes a phase-locked loop on the second side of the electrically isolated circuitry. The phase-locked loop is coupled with the optical link and configured to receive the divided clock signal from the optical link and generate a second signal at a multiple of a characteristic frequency of the divided clock signal so that the second signal comprises the characteristic frequency of the clock signal received by the divider circuitry.
35 Citations
15 Claims
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1. A system comprising:
- a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value;
an optical link coupled with the divider for receiving the divided clock signal and transmitting the divided clock signal from the first side of the electrically isolated circuitry to a second side of the electrically isolated circuitry; and phase-locked loop circuitry on the second side of the electrically isolated circuitry, the phase-locked loop circuitry coupled with the optical link and configured to receive the divided clock signal from the optical link and generate a second signal at a multiple of a characteristic frequency of the divided clock signal so that the second signal comprises the characteristic frequency of the clock signal received by the divider circuitry, wherein the phase-locked loop circuitry is disposed on a first integrated circuit chip, the optical link is disposed on a second integrated circuit chip, and the divider is disposed on a third integrated circuit chip, the phase-locked loop circuitry including a phase detector and filter and a voltage controlled oscillator, the voltage controlled oscillator directly coupled to a sigma-delta modulator, the voltage controlled oscillator supplying the second signal to the sigma-delta modulator and a divided feedback signal to the phase detector and filter. - View Dependent Claims (2, 3, 4, 5, 6)
- a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value;
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7. A system comprising:
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a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value; a first optical link coupled with the divider for receiving the divided clock signal and transmitting the divided clock signal from the first side of the electrically isolated circuitry to a second side of the electrically isolated circuitry; a second optical link for transmitting signals from the second side of the electrically isolated circuitry to the first side of the electrically isolated circuitry; and phase-locked loop circuitry on the second side of the electrically isolated circuitry, the phaselocked loop circuitry coupled with the first optical link and configured to receive the divided clock signal from the first optical link and generate a second signal at a multiple of a characteristic frequency of the divided clock signal so that the second signal comprises the characteristic frequency of the clock signal received by the divider circuitry, wherein the phase-locked loop circuitry is disposed on a first integrated circuit chip, the first optical link and the second optical link are disposed on a second integrated circuit chip, and the divider is disposed on a third integrated circuit chip, the phase-locked loop circuitry including a phase detector and filter and a voltage controlled oscillator, the voltage controlled oscillator directly coupled to a sigma-delta modulator, the voltage controlled oscillator supplying the second signal to the sigma-delta modulator and a divided feedback signal to the phase detector and filter. - View Dependent Claims (8, 9, 10, 11)
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12. A chip package comprising:
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a first integrated circuit chip comprising a divider on a first side of electrically isolated circuitry for receiving a clock signal having a characteristic frequency and dividing the clock signal by a characteristic value; a second integrated circuit chip comprising an optical link coupled with the divider for receiving the divided clock signal and transmitting the divided clock signal from the first side of the electrically isolated circuitry to a second side of the electrically isolated circuitry; and
a third integrated circuit chip comprising phase-locked loop circuitry on the second side of the electrically isolated circuitry, the phase-locked loop circuitry coupled with the optical link and configured to receive the divided clock signal from the optical link and generate a second signal at a multiple of a characteristic frequency of the divided clock signal so that the second signal comprises the characteristic frequency of the clock signal received by the divider circuitry, the phase-locked loop circuitry including a phase detector and filter and a voltage controlled oscillator, the voltage controlled oscillator directly coupled to a sigma-delta modulator, the voltage controlled oscillator supplying the second signal to the sigma-delta modulator and a divided feedback signal to the phase detector and filter. - View Dependent Claims (13, 14, 15)
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Specification