John Schwarz
1312 Jericho Road
Abington, PA 19001
(215) 887-6525

---

Objective

Electrical engineering position involving circuit design.

Profile

Over 30 years of experience in the design of analog and digital circuits used in magnetic recording, peripherals, memories and high-speed digital systems.

Areas of Special Expertise

• High performance clocking systems and skew analysis.
• Unidirectional and bidirectional system buses and cable buses.
• Usage rules for TTL, ECL and CMOS circuit families and surface-mount devices.
• Logic delay equations and wiring rules for high-speed logic circuits.
• PC board layout rules, crosstalk and impedance calculations, component placement, noise problems.
• The use of SPICE simulation to analyze complex circuit problems.

Professional Experience

Unisys Corporation (previously Sperry/Univac), Blue Bell, PA. Active in the design of numerous computer systems from 1956-1989. Of particular note are the following:

• Design of read, write and recovery circuits for magnetic recording systems, including design of an analog phase-locked loop, analysis of recording codes, read and write compensation.
• Design of semiconductor memory drive and receive circuits; delay and waveform analysis to control undershoot and clean switching edges.
• Design of clock and clock distribution systems.
• Extensive skew analysis.
• Design of cable buses and unique termination schemes. Design and analysis of high-speed system buses. Knowledgeable about Future Bus, IPI, SCSI and other peripheral interfaces.
• Investigation of noise in backpanels, PC cards, cables, connectors.
• Extensive experience with multilaminate PC cards and backpanels: impedance and crosstalk analysis of stripline and coated microstrip structures, layout rules, optimum component placement for low noise and high performance.

Additional Accomplishments:

• 6 technical papers published.
• 13 disclosers filed; 6 patents obtained.
• Completed 7 in-house technical courses.

Education

• BSEE University of Louisville, 1950
• MES (Engineering Science) Harvard University, 1953

In 1989 Unisys reorganized the engineering division assigning system development to Roseville, MN and closing the design center in Blue Bell, PA. This action caused the layoff of 350 members of the engineering staff, myself included.