Thomson Licensing

Tektronix, Inc.

Grass Valley (u.s.) Inc.

Gvbb Holdings S.a.r.l

Robert Allen Castlebary

Kevin E Cosgrove

Robert Lloyd Sherman

The amount of jitter incurred when reading data written into a FIFO can be reduced by clocking the FIFO with Read Clock pulses at a frequency xfwhere x is a whole integer and fis the frequency at which the memory is clocked to write data. Read Addresses are applied to the FIFO at a frequency on the order of fto identify successive locations in the memory for reading when the memory is clocked with read clocked pulses to enable reading of samples stored at such successive locations. The duration of at least one successive Read Addresses is altered in response to memory usage status to maintain memory capacity below a prescribed threshold.

Asynchronous jitter reduction technique

To achieve improved jitter performance within prescribed bandwidth constraints, a receiver () samples a digital signal () upon each of n periodic sample clock pulses that occur during the interval t, where n is chosen such that log(n+1) is an integer (x) greater than zero. At the each of each interval t, the receiver generates a x+1-bit sample value having a first bit indicating the value of the digital signal being sampled, and x remaining bits which collectively indicate a sample interval during which the digital signal changed states if such a change did occur When a change does occur, the receiver inverts the first bit of each sample value upon decoding to coincide with the change in the digital signal.

Technique for oversampling to reduce jitter

Bussing high frequency crosspoint switches is achieved by extending an output transmission line bus through an integrated circuit (IC) upon which the crosspoint switch is laid. The internal portion of the output transmission line bus is coupled to an output pad on the IC via a bond wire. This eliminates stubs from the output of the IC to the output transmission line as well as compensating for parasitic capacitance associated with the output pad.

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Nevada City, CA, United States of America

Robert Allen Castlebary