Low electromagnetic interference clock oscillator module

Details Low electromagnetic interference clock oscillator module Low electromagnetic interference clock oscillator module

1996-08-09

1998-07-14

Mis, David

Oscillators

With parasitic oscillation control or prevention means

331 78, 331158, 331175, 331108D, 327164, H03B 104, H03B 532

Patent

active

057810745

ABSTRACT:
A low noise clock oscillator in modular form to plug into a standard 14 or 8 pin DIP clock oscillator socket on the motherboard of a host device to retrofit the host device without redesign of the host device motherboard so that the host device can reduce its EMC emissions sufficiently to pass EMC emission tests. The oscillator is characterized by use of a spread spectrum clock generator, EMC filters between the clock generator and the Vcc, ground and clock bus coupling points to the motherboard and a single point ground connection to the motherboard. This oscillator module allows an easy retrofit to a host device that has already been designed to substantially lower EMC emissions that can be traced to the clock by as much as 20 dB without expensive, time consuming redesign efforts to add shielding, more grounds and possibly reroute the motherboard traces.

REFERENCES:
patent: 5302921 (1994-04-01), Shigemori et al.
patent: 5488627 (1996-01-01), Hardin et al.

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