Arrangement for supplying circuits with direct currents

Details Arrangement for supplying circuits with direct currents Arrangement for supplying circuits with direct currents

1995-12-07

2001-03-20

Cunningham, Terry D. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S545000, C326S100000, C307S126000

Reexamination Certificate

active

06204702

ABSTRACT:

FIELD OF THE INVENTION
The present invention generally relates to the field of electrical circuits, and more particularly, is directed to an arrangement for separately supplying at least two portions in an IC (Integrated Circuit) with direct currents from different power sources, for instance, where the IC includes both analog circuit components and digital circuit components.
BACKGROUND OF THE INVENTION
Recently, I
2
L (Integrated Injection Logic) circuits, which are known as a kind of digital circuit, have been employed in an analog IC in order to achieve higher integration and advanced functions in the analog IC since I
2
L circuits are suited for coexisting with individual analog circuits. In this case, the analog IC including some I
2
L circuits is typically designed so that it receives direct currents from at least two different power sources for respectively being supplied to the I
2
L circuits and the remaining analog circuits in order to prevent electrical interference between these two types of circuit and/or to supply different voltages to these respective types of circuit.
In the case where the analog IC has at least two routes for respectively supplying direct currents received from different power sources, the analog IC can be set in a waiting state, for example, when the first power supply is in an off-state but the second power supply is in an on-state. In a bus-line interface of an IC for instance, during the waiting state, the I
2
L circuits receive direct currents by the second power supply, while the remaining analog circuits do not receive direct currents due to the off-state of the first power supply. By this process, before the analog circuits are activated, bus-data can be set into the Analog IC and held in some of the I
2
L circuits, or bus-lines at the output interface of the analog IC may be supplied with data held in the activated I
2
L circuits.
However, in the conventional analog IC which includes a plurality of I
2
L circuits, all the I
2
L circuits receive currents, and in spite of some of the I
2
L circuits being unused, these I
2
L circuits are activated. For this reason, the greater the number of unused I
2
L circuits, the more idle current is wasted. As a result, such analog IC gets to have a high electricity consumption.
SUMMARY OF THE INVENTION
In accordance with the present invention, a circuit which is suitable for being driven by at least two different direct current sources is provided. In the circuit, first portion is driven by a voltage supplied from a first direct current source, and a second portion is driven by a voltage supplied from a second direct current source. Moreover, a third portion is provided in the circuit, and is driven by the voltage supplied from the second direct current source on a condition of the existence of the voltage supply from the first direct current source to the circuit.
It is therefore an object of the present invention to provide an arrangement of a circuit by which a wasteful electricity consumption is eliminated.
Another object of the present invention is to provide an IC having different types of individual circuits in which only desired circuits are activated prior to the activation of the whole IC.
The above and other objects of the present invention will become clearer upon an understanding of the illustrative embodiments described below. Various advantages, which may not be referred to herein, will also occur to those skilled in the art upon employment of the present invention in practice in view of the disclosure herein.


REFERENCES:
patent: 4531065 (1985-07-01), Nakayama et al.
patent: 4924112 (1990-05-01), Anderson et al.
patent: 5021680 (1991-06-01), Zaw Win et al.
patent: 5047663 (1991-09-01), Lee et al.
patent: 5140183 (1992-08-01), Takenaka
patent: 5153452 (1992-10-01), Iwamura et al.
patent: 5208488 (1993-05-01), Takiba
patent: 5225716 (1993-07-01), Endo et al.
patent: 5317207 (1994-05-01), Mortensen
patent: 59-45258 (1984-11-01), None

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