Use of shunt resistor with large RA product tunnel barriers

Details Use of shunt resistor with large RA product tunnel barriers Use of shunt resistor with large RA product tunnel barriers

2006-05-30

2006-05-30

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S067000, C360S234400, C360S235500, C360S313000, C360S324200

Reexamination Certificate

active

07054085

ABSTRACT:
A read head for use with an interconnect transmission line having a characteristic impedance of Z0includes a tunnel valve device and a shunt resistor RS that is connected in parallel across the tunnel valve device. The tunnel valve device has a device resistance RTcorresponding to a predetermined resistance-area (RA) product. The value of the shunt resistance is based on the parallel combination of RTand RSsubstantially equaling the characteristic impedance Z0of the interconnect transmission line. The predetermined resistance-area (RA) product is about equal to at least about 10 Ohms-μm2. Alternatively, the predetermined resistance-area (RA) product is about equal to a “corner” value of RAcfor the tunnel valve device.

REFERENCES:
patent: 5883767 (1999-03-01), Coffey et al.
patent: 6359289 (2002-03-01), Parkin
patent: 6667842 (2003-12-01), Comeau et al.
patent: 6846991 (2005-01-01), Girard et al.
patent: 6848169 (2005-02-01), Shin et al.

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