Artifact Details


Alfke patent notebook (#1218)

Catalog Number







Alfke, Peter H.

Biographical Notes

Peter H. Alfke earned an MSEE from the Technical University in Hannover, Germany. He designed digital circuits and systems at LM Ericsson and Litton Industries in Sweden for nine years before joining Fairchild in the US in 1966 as an applications engineer. He served as manager of factory support for the field applications group at Advanced Micro Devices (AMD) for more than 10 years and joined Xilinx as director of applications engineering in 1988. He retired from Xilinx in 2009. In a tribute published by Xilinx after his death in 2011, Alfke is credited as being “the first person to implement a FIFO in an integrated circuit, a task he accomplished while working at Fairchild in 1969.”


Fairchild Semiconductor

Identifying Numbers

Document number 1218


Approximately 13 dated entries over 17 pages.


12 x 10 inches


This volume contains circuit and logic designs for proposed new digital integrated circuits and their applications. The first entry, “TTL with floating output” (p. 1), was an independent invention of the TTL Tri-State output circuit. A patent proposal was discontinued when earlier disclosures at National Semiconductor and HP were discovered. An entry “Improved phase-locked loop freq synthesizer” (p. 11) was the basis for U.S. patent 4023116 below.


The author is named as inventor on 39 U.S. patents, including 2 patents assigned to Fairchild:

U.S. patent 4023116, “Phase-locked loop frequency synthesizer.” Filed 1976-07-08. Issued 1977-05-10.

U.S. patent 4084082, “Programmable counter.” Filed 1976-10-12. Issued 1978-04-11.



Collection Title

Fairchild Semiconductor notebooks and technical papers


The author contributed to the following papers in professional publications during his service at Fairchild:

Alfke, P., Doyle, N., Hamaoui, M., and Hibbe, O., An approach to ultrasonic remote control systems. IEEE Transactions on Broadcast and Television Receivers, Vol. BTR-19, Iss. 4 (1973): 256 – 262.

Breeze, E. G., Rothstein, J., Alfke, P. and Hamaoui, H., A frequency synthesizer for television receivers. IEEE Transactions on Broadcast and Television Receivers, Vol. BTR-20, Iss. 4 (1974): 259 – 264.


Gift of Texas Instruments Incorporated

Lot Number