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This is a technique for stabilizing an integrated circuit current switch by utilizing collector-to-substrate capacitance (CCS).
English (United States)
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Stabilization of Integrated Circuit Current Switch
This is a technique for stabilizing an integrated circuit current switch by
utilizing collector-to-substrate capacitance (CCS).
A currently known technique for stabilizing an integrated circuit current switch
is illustrated in Fig. 1. The current switch includes transistors T1 and T2 and
current source I. Stabilization is obtained by extending the base region of one of
the transistors, such as T1, resulting in some resistance R and the added
capacitance C at the base input node, providing the stabilization.
In order to use the subcollector to form the desired stabilizing capacitance, a
P type resistor of the type illustrated in Figs. 2A and 2B can be used. The top
view (Fig. 2A) illustrates the spaced-apart contact holes F normally used as the
resistor contacts. As further illustrated in Fig. 2B, under the P-type resistor there
is an N+ subcollector, and the entire structure is supported on a P- type
substrate. Isolation between devices is provided b a recessed oxide isolation
(ROI) in combination with a P+ type isolation diffusion thereunder.
As illustrated in Fig. 3A, one of the contact holes F is made somewhat larger.
The subcollector of the P resistor is connected to the low voltage node of the
resistor (transistor base node) through the subsequently formed N+ type reach-
through diffusion. Thus, a capacitance is formed by the N+ type subcollector and
the P- type material. At its minimum, the resulting capaci...