Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-04-27
2000-08-08
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327362, 327540, H01J 1982
Patent
active
061007501
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a frequency-independent voltage divider comprising a reference terminal; an input terminal for receiving an input signal with respect to the reference terminal; an output terminal for supplying an output signal with respect to the reference terminal; and a series arrangement of resistors coupled between the input terminal and the reference terminal, which resistors are connected to one another in nodes, of which nodes at least node is loaded by at least one respective parasitic capacitor coupled between the reference terminal and the at least one node, and of which nodes the at least one node is coupled to the input terminal via a respective compensation capacitor.
Such a frequency-independent voltage divider is known from the general state of the art. An example of this is an oscilloscope probe comprising a series arrangement of two resistors coupled between the input terminal and the reference terminal. The two series-connected resistors have their common node connected to the output terminal. The output terminal and the reference terminal are connected to an input of an oscilloscope. The input of the oscilloscope behaves substantially as a parasitic capacitance with respect to the oscilloscope probe. As a result of this, the oscilloscope probe in conjunction with the parasitic capacitance would behave not only as a voltage divider but also as a low-pass filter, if the oscilloscope had not been provided with a compensation capacitor coupled between the input terminal and the node common to the two series-connected resistors. Thus, a frequency-independent voltage divider is obtained when the oscilloscope probe is suitably dimensioned.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved frequency-independent voltage divider.
To this end, according to the invention, a frequency-independent voltage divider of the type defined in the opening paragraph is characterized in that the series arrangement of resistors comprises at least three resistors, and the number of compensation capacitors is at least two. The series arrangement of resistors now has a plurality of nodes. At option, the output terminal can be connected to one of the nodes. It is also possible to take off a plurality of output signals at the same time by coupling different output terminals to different nodes. Thus, it is possible that a plurality of these different nodes are loaded by a parasitic capacitor. It may be desirable that all the nodes provide output signals which are frequency-independent. The invention meets this requirement by the provision of a plurality of compensation capacitors.
The invention further relates to a frequency-independent voltage divider comprising a reference terminal; an input terminal for receiving an input signal with respect to the reference terminal; an output terminal for supplying an output signal with respect to the reference terminal; and a conductor track having a first end and a second end coupled to the reference terminal and the input terminal, respectively, which conductor track has a tap coupled to the output terminal, and which conductor track is loaded by a distributed parasitic capacitor constituted by the conductor track, a conductive substrate, which is coupled to the reference terminal, and an insulator, which isolates the conductor track electrically from the conductive substrate.
The invention is further characterized in that the frequency-independent voltage divider comprises a distributed compensation capacitor having one side coupled to the input terminal and having another side coupled to the conductor track in a distributed fashion. The conductor track, the distributed parasitic capacitance, and the distributed compensation capacitance respectively correspond to the series arrangement of resistors, the parasitic capacitor, and the compensation capacitor. This correspondence can be understood when the conductor track is regarded as an infinite number of infinitesimal series-connected resistors.
German Pat
REFERENCES:
patent: 4586008 (1986-04-01), Raleigh
patent: 4968901 (1990-11-01), Shacter
patent: 5589790 (1996-12-01), Allen
patent: 5600276 (1997-02-01), Imamura et al.
patent: 5631598 (1997-05-01), Miranda et al.
patent: 5898312 (1999-04-01), Uhling et al.
Biren Steven R.
Callahan Timothy P.
Kim Jung Ho
U.S. Philips Corporation
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