Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1990-04-27
1993-01-26
Dzierzynski, Paul M.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333184, 333185, H03H 700
Patent
active
051825317
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is directed to an interference protected electronic device including a signal processing circuit part to which lines are guided from external circuits, specifically at least one line for supplying operating current or voltage, at least one line for signal inputs and/or a line for signal outputs, and circuit means assigned to at least one line of the signal processing circuit part and constructed as a filter circuit, for damping high-frequency interference voltage which is induced by external electromagnetic fields and whose amplitude is greater than a linear control range of circuit elements of the signal processing circuit part.
Such appliances are already known, e.g. from U.S. Pat. No. 4,668,873. The signal parts of these appliances can contain electronic transformation elements such as operational amplifiers and comparators serving to process the signals, multivibrator circuits serving as pulse shapers, digital circuit parts or the like.
The known appliances of the type named in the beginning utilize filter circuits which are constructed with discrete components using printed circuit board technology, but also in hybrid construction on ceramic substrates. Interference voltage can be damped to the desired degree with such filter circuits; they are therefore usable in principle, e.g. also in motor vehicles, where interference voltage with a high amplitude in a broad frequency range e.g. between 150 KHz and 1 GHz always occur at least as soon as the motor vehicle moves in the near field of a high-power transmitter.
If such systems are monolithically integrated at least as partial systems, this means that the filter circuits must also be monolithically integrated. In so doing, the following problem arises: rectified voltage occurs at the p-n junctions of the transformation elements serving to process the signals in the signal processing circuit part which rectified voltages shift the operating points of these transformation elements, which leads to operating errors of, the circuit parts.
SUMMARY OF THE INVENTION
The present invention is characterized in that the circuit means, which are assigned to at least one line, are monolithically integrated, comprise elements for damping high-frequency interference voltage, and are constructed in such a way that interference voltage in the range of the greater amplitudes does not generate any rectified voltage or rectified current which noticeably shifts the operating points of circuit elements of the signal processing circuit part.
The electronic device, according to the invention has the advantage that interference voltage having a higher amplitude in the frequency range in question, preferably between 150 KHz and 1 GHz, is also damped in such a way that it does not lead to rectified voltage or rectified current which noticeably shifts the operating points of the circuit elements of the signal processing circuit part.
The invention is explained in more detail with the aid of the drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows a known arrangement of a first and second electronic device, wherein both devices are connected with one another by means of plug-in connection lines.
FIG. 2 shows the same arrangement as in FIG. 1, but with the addition, of a filter circuit;
FIG. 3 shows, by way of example, an electronic device which is connected with a vehicle battery on the one hand by means of a cable harness and via safety fuse and switch and, on the other hand, with a second electronic device on the input side and with an engine on the output side;
FIG. 4 shows the amplitude ch other the frequency for the complex line system of FIG. 3;
FIG. 5A shows the section of and FIG. 5b shows the layout of an exemplary bipolar process for showing the subject matter of the invention;
FIGS. 6a, b, 7a, b and 8a, b show an exemplary implementation of capacitors in the device of FIGS. 5a and 5b;
FIG. 9 shows the equivalent circuit of a first embodiment example of a monolithic integrated filter circuit acting in the manner of the circuit according to
REFERENCES:
patent: 4737739 (1988-04-01), Rosier et al.
patent: 4758805 (1988-07-01), Yamazaki et al.
patent: 4875457 (1989-10-01), Fitzner
Conzelmann Gerhard
Fieldler Gerhard
Dzierzynski Paul M.
Neyzari Ali
Robert & Bosch GmbH
Striker Michael J.
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