EMI shield for reducing clock jitter of a transceiver
View Patent ↗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.
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, wherein the metal shield is soldered to a ground ring on a printed circuit board, wherein the metal shield comprises:
one or more positioning protrusions perpendicular to the printed circuit board that enter into holes in the printed circuit board; and
one or more attachment protrusions parallel to the printed circuit board for soldering the metal shield to the ground ring.
2. The transmitter of claim 1 , wherein the ground ring is electrically coupled to one or more ground planes of the printed circuit board.
3. The transmitter of claim 1 , wherein the metal shield is comprised at least partially of copper.
4. The transmitter of claim 1 , wherein the oscillator is a voltage-controlled oscillator.