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Description  |
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BACKGROUND OF THE INVENTION
The present invention broadly relates to a new and improved construction of
a controlled switching array.
In its more particular aspects the present invention specifically relates
to a new and improved construction of a controlled switching array for
switching through or commutating input signals which are applied to an
input side of a commutator or switching component in the controlled
switching array, to the output side of such commutator or switching
component.
Controlled switching arrays of such type are frequently employed in order
to establish and exchange electrical connections between output terminals
of any desired component and input terminals of other components. However,
such switching arrays have proven disadvantageous for use at relatively
high frequencies with regard to ensuring sufficient decoupling between
signal lines which are not momentarily interconnected via a coupling
point.
SUMMARY OF THE INVENTION
Therefore, with the foregoing in mind it is a primary object of the present
invention to provide a new and improved construction of a controlled
switching array which does not exhibit the aforementioned drawbacks and
shortcomings of prior art constructions.
It is a further and more specific object of the present invention to
provide a new and improved construction of a controlled switching array
which ensures sufficient decoupling between signal lines which momentarily
are not interconnected.
Now in order to implement these and other objects of the invention which
will become more apparent as the description proceeds, the controlled
switching array of the present development is manifested by the features
that, the switching array contains at least three commutator or switching
components associated with at least three signal distributors. Input
signals can be applied to the signal distributors and are, in turn,
supplied to the respective inputs of the commutator or switching
components. At least two commutator or switching components are arranged
at least approximately at the same location but on different sides of a
printed circuit board.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set
forth above will become apparent when consideration is given to the
following detailed description thereof. Such description makes reference
to the annexed drawings wherein throughout the various figures of the
drawings there have been generally used the same reference characters to
denote the same or analogous components and wherein:
FIGS. 1A and 1B respectively show a diagrammatic view of the top side and
the bottom side of a printed circuit board equipped with various
commutator or switching components of a first exemplary embodiment of the
inventive controlled switching array; and
FIGS. 2A and 2B respectively show a diagrammatic view of the top side and
the bottom side of a printed circuit board equipped with various
commutator or switching components of a second exemplary embodiment of the
inventive controlled switching array.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Describing now the drawings, it is to be understood that to simplify the
showing thereof, only enough of the structure of the controlled switching
array has been illustrated herein as is needed to enable one skilled in
the art to readily understand the underlying principles and concepts of
the present invention. Turning now specifically to FIGS. 1A and 1B of the
drawings, there is illustrated therein a first exemplary embodiment of the
inventive controlled switching array containing four commutator or
switching components A, B, A, and B', each of which is represented by a
quadrangle or box. A first and a second commutator or switching component
A and B are arranged on the top side or upper side O (FIG. 1A), and a
third and a fourth commutator or switching component A' and B' (FIG. 1B)
are exactly oppositely arranged at the bottom side or lower side U of a
printed circuit board conveniently symbolized by the axis SA in each of
FIGS. 1A and 1B. Therefore, the boxes A and A' and the boxes B and B' in
FIG. 1A and FIG. 1B, respectively represent mirror images of each other
with respect to axis SA.
In order to maintain low levels of crosstalk between one side O or U and
the other side U or O, as the case may be, of a printed circuit board, the
commutator or switching components A, B, A', and B' are constructed as
surface mounted devices which are fixed in a flat configuration to the
printed circuit board and then soldered.
FIGS. 1A and 1B indicate respective control signals a1, a2, a3, a4; b1, b2,
b3, b4; a'1, a'2, a'3, a'4 and b'1, b'2, b'3, b'4 for the commutator or
switching components A, B, A', and B' and such control signals are fed to
appropriate terminals. The commutator or switching component A comprises
an input side I.sub.A containing four signal inputs u1, u2, u3, and u4 and
one signal output X. The commutator or switching component B also
comprises an input side I.sub.B with four signal inputs v1, v2, v3, and v4
and one signal output Y. The commutator or switching component A' likewise
comprises an input side I.sub.A, with four signal inputs u'1, u'2, u'3,
and u'4 and one signal output Z. The commutator or switching component B'
comprises an input side I.sub.B, with four signal inputs v'1, v'2, v'3,
and v'4 and one signal output W.
The controlled switching array according to FIGS. 1A and 1B further
comprises four signal distributors 1, 2, 3 and 4 each of which contains
three signal splitters. Specifically, there is provided a first signal
distributor 1 including the signal splitters T1, T2, and T3 for an input
signal x at an input TI.sub.1. The second signal distributor 2 includes
the signal splitters T4, T5, and T6 and receives an input signal y at an
input TI.sub.2. The third signal distributor 3 includes the signal
splitters T7, T8, and T9 and receives an input signal z at an input
TI.sub.3. The fourth signal distributor 4 includes the signal splitters
T10, T11, and T12 and receives an input signal w at an input TI.sub.4.
Thus, the input signal x is conducted by means of the first signal
distributor 1 to the inputs u1, v1, u'1, and v'1. The input signal y is
conducted by means of the second signal distributor 2 to the inputs u2,
v2, u'2, and v'2. The input signal z is conducted by means of the third
signal distributor 3 to the inputs u3, v3, u'3, and v'3. The input signal
w is conducted by means of the fourth signal distributor 4 to the inputs
u4, v4, u'4, and v'4.
It is of importance in the embodiment shown in FIGS. 1A and 1B, that an
output 4A of the signal splitter T4 comprises a relatively long or
extended conductor or wire connector Ly on the top or upper side O of the
printed circuit board for connection to an input 6A of the signal splitter
T6. Also, an output 7A of the signal splitter T7 is connected via a
relatively long or extended conductor track or connecting wire Lz on the
bottom or lower side U of the printed circuit board with an input 9A of
the signal splitter T9. The conductors or connecting wires Ly and Lz, for
instance, may be arranged below the commutator or switching components A
and B or A' and B', namely such as to be approximately located at the
center of their surfaces, in particular within the space between the
commutator or switching components A and B or A' and B'.
The controlled switching array according to FIGS. 1A and 1B functions as
follows:
The commutator or switching component A is controlled by the control
signals a1, a2, a3 and a4 or as well by less than such four control
signals such that either the input signal x from the input u1, the input
signal y from the input u2, the input signal z from the input u3 or the
input signal w from the input u4 is conducted to the output X. A
corresponding situation exists for the other commutator or switching
components B, A' and B'. Through-contacts are provided at the outputs Z
and W from the bottom or lowerside U to the top or upper side O of the
printed circuit board.
Due to this particular construction together with a suitable conductor path
or track layout there results the advantage that excellent decoupling is
accomplished of the signal conductors from each other and from the output
side or outputs X, Y, W and Z.
The second embodiment of the inventive controlled switching array shown in
FIGS. 2A and 2B has a different arrangement using similar elements as in
the first embodiment described hereinbefore with reference to FIGS. 1A and
1B. In this arrangement, however, the conductor or wire connector Ly which
connects the output 4A of the signal splitter T4 and the input 6A of the
signal splitter T6, is arranged at the greatest possible spacing from all
of the elements and, therefore, is located nearly at the edge of the
printed circuit board. The same is true for the conductor or connecting
wire Lz which connects the output 7A of the signal splitter T7 with the
input 9A of the signal splitter T9.
The controlled switching array as shown in FIGS. 1A and 1B or FIGS. 2A and
2B can also operate with only three commutator or switching components,
e.g. the commutator or switching components A, B, and A'. In this case the
commutator or switching component B and the signal splitters T12, T3, T5
and T9 are omitted such that direct connections must be made between the
signal splitter T10 and the input u1, the signal splitter T1 and the input
u'1, the signal splitter T7 and the input v3 via the conductor or
connecting wire Lz, and the signal splitter T4 and the input v2. It is
also possible to provide a conductor or connecting wire like the conductor
or connecting wire Ly shown in FIG. 1A or FIG. 2A in combination with a
conductor or connecting wire like the conductor or connecting wire Lz
shown in FIG. 2B or FIG. 1B.
In a controlled switching array as shown in FIGS. 1A, and 1B or FIGS. 2A,
and 2B, the printed circuit board may comprise a multi-layer printed
circuit board which contains at least one layer partly comprising a ground
plane layer and partly containing conductor guide tracks
(micro-strip/co-planar).
The controlled switching array as shown in FIGS. 1A, and 1B or FIGS. 2A,
and 2B may also comprise a multi-layer printed circuit board which, for
instance, contains a median ground plane layer which, together with an
upper and lower layer, forms conductors (strip line) in micro-strip or
co-planar technique. The multi-layer printed circuit board also may
comprise two ground plane layers and a median or intermediate layer
arranged therebetween and containing or carrying the conductors or
connecting wires (triplate conductors).
While there are shown and described present preferred embodiments of the
invention, it is to be distinctly understood that the invention is not
limited thereto, but may be otherwise variously embodied and practiced
within the scope of the following claims.
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