Low noise propagation semiconductor device

Active solid-state devices (e.g. – transistors – solid-state diode – Integrated circuit structure with electrically isolated... – Lateral bipolar transistor structure

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257544, H01L 2900

Patent

active

057897980

ABSTRACT:
A semiconductor device has a p-n-p transistor structure having a collector implemented by a p.sup.- -substrate, a base formed as an n-diffused region in the surface region of the substrate, and an emitter formed as a p.sup.+ -diffused region in the first n-diffused layer. The p.sup.- -substrate and the n-base are maintained at a ground level, while the p.sup.+ -collector is maintained at a positive potential for biasing the p-n junction formed between the emitter and the base. The bias potential allows the p-n-p transistor structure to operate in its saturation region to activate the base region to define an enlarged carrier-incresed zone. An analog input pad is located within the carrier-increased zone and protected from a noise propagated from a digital circuit section located outside the carrier-increased zone.

REFERENCES:
patent: 3197681 (1965-07-01), Broussard
patent: 3615938 (1971-10-01), Tsai
patent: 3758797 (1973-09-01), Peterson et al.
patent: 3946425 (1976-03-01), Shoji et al.
patent: 4110782 (1978-08-01), Nelson et al.
patent: 4170501 (1979-10-01), Khajezadeh
patent: 4792837 (1988-12-01), Zazzu

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