Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1980-05-01
1981-09-08
Larkins, William D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
357 13, 357 27, 357 35, 357 36, H01L 2982
Patent
active
042887089
ABSTRACT:
A new semiconductive device for sensing uniaxial magnetic fields is described. The sensor is essentially a dual collector lateral bipolar transistor operated in the avalanche region. Each of the collectors exhibits two space charge resistance effects. One effect produces a negative resistance and the other produces a positive resistance. When the two space charge resistances are carefully balanced, a net zero collector resistance is achieved. A balanced condition can be maintained for a broad range of collector currents. A vertical VI property is thereby achieved. It has been found that the positive space charge resistance characteristic is inversely proportional to the ionization area and that the negative component is proportional to the area in the avalanche zone at each collector. It has been found that a magnetic field can modulate the ionization areas at the collector junctions. The area modulated results in modulation of the positive and negative space charge resistances at each collector and a resultant shift in the avalanche voltage occurs for each collector. A differential output may be obtained since the modulation effect operates oppositely on each of the collector junction areas. This mechanism accounts for the linear and differential magnetoresistive behavior of the device.
REFERENCES:
patent: 3714559 (1973-01-01), Bate
patent: 3829883 (1974-08-01), Bate
patent: 4129880 (1978-12-01), Vinal
Duffield Edward H.
International Business Machines Corp.
Larkins William D.
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