EMI shield for reducing clock jitter of a transceiver
First Claim
Patent Images
1. A transmitter comprising:
- an oscillator enclosed in a metal shield;
a Phase Lock Loop (PLL) coupled to the oscillator;
a serializer coupled to receive a clock signal from the PLL and to provide serial data; and
an electrical-to-optical converter coupled to the serializer to convert the serial data to optical signals.
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Abstract
A transmitter comprises an oscillator, a phase lock loop, a serializer, and an electrical-to-optical converter. The oscillator is enclosed in a metal shield. The metal shield is soldered to a ground ring of the printed circuit board. In one embodiment, the oscillator is voltage-controlled oscillator.
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Citations
20 Claims
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1. A transmitter comprising:
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an oscillator enclosed in a metal shield;
a Phase Lock Loop (PLL) coupled to the oscillator;
a serializer coupled to receive a clock signal from the PLL and to provide serial data; and
an electrical-to-optical converter coupled to the serializer to convert the serial data to optical signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A transceiver comprising:
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a printed circuit board;
a receiver coupled to the printed circuit board; and
a transmitter coupled to the printed circuit board, the transmitter comprising an oscillator, a phase lock loop coupled to the oscillator, and a metal shield covering the oscillator, the metal shield coupled to a ground ring of the printed circuit board. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of reducing clock jitter in a transmitter having an oscillator comprising:
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attaching the oscillator to a printed circuit board having a ground ring;
placing a metal shield around the oscillator, wherein the metal shield is in electrical contact with the ground ring. - View Dependent Claims (17, 18, 19, 20)
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Specification