DE102017005152A1 - Use of a reconfigurable logic module for converting an analog voltage into a digital data stream and apparatus for analog-to-digital conversion of an analog voltage into a digital data stream - Google Patents

Abstract

Use of a reconfigurable logic module for converting an analog voltage into a digital data stream and apparatus for analog-to-digital conversion of an analog voltage into a digital data stream, the logic module having an input provided for differentially transmitted data signals, the input having a first terminal and a second terminal, wherein the first terminal is supplied to the non-inverting input of a comparison means of the logic module and the second terminal to the inverting input of the comparison means, the analog voltage being supplied to the input, in particular via a resistor, to the first terminal of the input.

Description

The invention relates to a use of a reconfigurable logic module for converting an analog voltage into a digital data stream and a device for analog-to-digital conversion of an analog voltage into a digital data stream.

It is well known that a reconfigurable logic device is also referred to as an FPGA.

From the US 5 153 462 A As the closest prior art, a programmable logic circuit with voltage comparator is known.

From the US 5 196 740 A An integrated circuit for an analog system is known.

From the US 2012/0 070 155 A1 a flexible configurable optical subsystem is known.

From the US 2009/0 224 835 A1 is a high-speed preamplifier known.

From the US 6,956,512 B1 An analog-to-digital converter for a programmable logic circuit is known.

The invention is therefore based on the object of developing an analog-to-digital conversion.

According to the invention the object is achieved in the use of the in claim 1 and in the apparatus according to the features indicated in claim 10.

Important features of the invention when using a reconfigurable logic module for converting an analog voltage into a digital data stream are that the logic module has an input intended for differentially transmitted data signals,
the input having a first terminal and a second terminal,
wherein the first terminal is supplied to the non-inverting input of a comparison means of the logic module and the second terminal to the inverting input of the comparison means,
wherein the analog voltage is supplied to the input, in particular via a resistor, to the first terminal of the input.

The advantage here is that an FPGA can be used for analog-to-digital conversion. In this case, an already existing input for differentially transmitted data signals is used in a novel way, namely for supplying an analog voltage, which is to be converted into a digital data stream.

In an advantageous embodiment, the analog voltage is the output signal of a sensor unit. The advantage here is that the signal of a sensor directly to the one digital data stream generating device, comprising the FPGA, can be fed. Thus, a logic device, which is actually intended for the execution of logic links, now as an analog-to-digital converter co-usable.

In an advantageous embodiment, the analog voltage is supplied via a resistor to the first terminal, in particular therefore to the non-inverting input of the comparison means, wherein a reference voltage is supplied to the inverting input of the comparison means. The advantage here is that the output voltage is mitzuführbar via another resistor. In addition, a capacity for forming a low pass is added, so that the supplied signal is smoothed.

In an advantageous embodiment, the output voltage of the comparison means is also supplied via a resistor to the non-inverting input of the comparison means. The advantage here is that one of the mean value between the analog voltage and the output voltage of the comparison means can be fed to the non-inverting input of the comparison means. The comparison means then compares the voltage applied to this non-inverting input of the comparison means with the voltage applied to the inverting input of the comparison means reference voltage.

In an advantageous embodiment, the resistors have the same value. The advantage here is that the average of analog voltage and output voltage of the comparison means can be fed to the non-inverting input of the comparison means.

In an advantageous embodiment, the output voltage of the comparison means is supplied to a series connection of summers of the logic module whose output signal is supplied to a series connection of subtractors of the logic module. The advantage here is that a conversion by means of delta-sigma converter is executable.

In an advantageous embodiment of the series circuit of summers and the series connection of subtractors, a clock signal of the logic module is supplied. The advantage here is that a synchronous operation of the components of the delta-sigma converter is executable.

In an advantageous embodiment, the output signal of the series connection of summers via a controllable switch of the logic module to the input of the series circuit of Subtractors fed. The advantage here is that a clocked conversion is possible.

In an advantageous embodiment, the housing of the logic module surrounds the comparison means, the subtractor and the totalizer. The advantage here is that the logic device for a novel purpose, namely the analog-to-digital conversion, can be used.

Important features in the device for analog-to-digital conversion of an analog voltage into a digital data stream are that the device has resistors, in particular ohmic resistors, and a reconfigurable logic module,
wherein the logic device has an input intended for differentially transmitted data signals,
the input having a first terminal and a second terminal,
wherein the first terminal is supplied to the non-inverting input of a comparison means of the logic module and the second terminal to the inverting input of the comparison means,
wherein the analog voltage is applied between a zero potential, in particular ground, and a first resistor, which is connected to the first terminal of the input.

The advantage here is that the logic device, so an FPGA, is usable for an analog-to-digital conversion. In particular, a differential data signal input can be used as input for the analog voltage to be converted. The logic block is reconfigurable. Thus, it is therefore suitable for various applications. On the one hand, it can be used as a receiving-side data transmission element for receiving a differentially present data signal and on the other hand it can be used as an analog-to-digital converter, wherein the same input is used as in the differential data transmission.

In an advantageous embodiment, a capacitor is arranged between the zero potential and the first terminal of the input. The advantage here is that a low-pass filtering is executable.

In an advantageous embodiment, the output signal of the comparison means is electrically connected to an externally contactable contact of the logic module,
wherein the first terminal of the input and the contact are connected by means of a second resistor. The advantage here is that a simple external wiring of the logic device with resistors and at least one capacitor is sufficient.

In an advantageous embodiment, the second terminal is connected to the zero potential by means of a third resistor. The advantage here is that the input resistance at the input of the comparison means is predetermined accordingly

In an advantageous embodiment, the reference voltage between a zero potential, in particular ground, and a fourth resistor is applied, which is connected to the second terminal of the input. The advantage here is that the input resistance at the input of the comparison means is predetermined accordingly

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination possibilities of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or posing by comparison with the prior art task arise.

The invention will now be explained in more detail with reference to figures:

In the 1 is an inventive use of a reconfigurable logic device 2 , in particular FPGA (field programmable gate array), shown together with its input circuit, wherein an input side analog signal U_A in a digital data stream 3 is converted.

In the 2 are an exemplary analog input signal U_A and the associated digital data stream 3 shown.

As shown in the figures, the reconfigurable logic device 2 an LVDS input adapted to supply differential data signals.

In this case, an input circuit of resistors R and a capacitor C is provided at the LVDS input.

The input consists of two terminals, wherein a first of the two terminals is connected to the first terminal of a capacitor C whose second terminal is connected to ground. The first of the two terminals is supplied via a resistor R, the analog voltage U_A.

The first terminal is connected to a first input, in particular the non-inverting input of a comparison means 2 , in particular operational amplifier 2 , the reconfigurable logic module connected.

The other terminal is connected to the second input, in particular to the inverting input of the comparison means 2 , connected.

The output of the comparator 1 , In particular, operational amplifier, is supplied via a resistor to the first terminal, in particular so the non-inverting input of the comparison means 2 ,

The inverting input of the comparison means 2 is connected via a resistor to a reference voltage.

Thus, therefore, an actually intended for differentially transmitted data signal input used as input for an analog voltage. This is for example generated by a sensor unit, which converts the value of a physical quantity, such as temperature, current or pressure or the like, into the analog voltage, wherein the respective value of the analog voltage represents the respective value of the physical quantity.

The output voltage of the comparison means 1 is fed to a filter which is in 1 by way of example as a sinc ^ 3 filter, that is to say consisting of three adders arranged in series and subsequently three adders arranged in series, the same clock signal CLK being supplied to the summers and the subtractors in each case.

The data stream generated in this way 3 is for a sinusoidal analog voltage U_A in 2 exemplified.

If an analog voltage U_A is applied, which is greater than the reference voltage, is at the output of the comparison means 1 generates a HIGH signal. By the return of the output signal via a in the 1 not shown flip-flop circuit, so bistable flip-flop, can be a synchronization to the clock signal CLK reach, if this is also fed to the flip-flop circuit.

In a further embodiment of the invention, a controllable switch is arranged between the series connection of the adder and the series circuit of the differential former, which is clocked synchronously to the clock CLK.

LIST OF REFERENCE NUMBERS

1

Comparative means, in particular operational amplifier

2

reconfigurable logic module, in particular FPGA (field programmable gate array)

3

digital data stream

CLK

clock

R

resistance

C

capacitor

U_A

analog voltage

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 5153462 A [0003]
• US 5196740 A [0004]
• US 2012/0070155 A1 [0005]
• US 2009/0224835 A1 [0006]
• US Pat. No. 6,953,512 B1 [0007]

Claims (14)

Use of a reconfigurable logic module for converting an analog voltage into a digital data stream, wherein the logic module has an input for differentially transmitted data signals input, wherein the input has a first terminal and a second terminal, wherein the first terminal supplied to the non-inverting input of a comparison means of the logic device is and the second terminal of the inverting input of the comparison means, characterized in that the analog voltage to the input, in particular via a resistor to the first terminal of the input, is supplied. Use according to claim 1, characterized in that the analog voltage is the output signal of a sensor unit. Use according to at least one of the preceding claims, characterized in that the analog voltage is supplied via a resistor to the first terminal, in particular therefore to the non-inverting input of the comparison means, a reference voltage is supplied to the inverting input of the comparison means. Use according to at least one of the preceding claims, characterized in that the output voltage of the comparison means is also supplied via a resistor to the non-inverting input of the comparison means. Use according to claim 4, characterized in that the resistors have the same value. Use according to at least one of the preceding claims, characterized in that the output voltage of the comparison means is supplied to a series connection of summers of the logic module whose output signal is supplied to a series circuit of subtractors of the logic module. Use according to claim 6, characterized in that the series connection of summers and the series connection of subtractors, a clock signal of the logic module is supplied. Use according to claim 6 or 7, characterized in that the output signal of the series connection of summers via a controllable switch of the logic module to the input of the series circuit of subtractors can be fed. Use according to claim 6, 7 or 8, characterized in that the housing of the logic module surrounds the comparison means, the subtractor and the summers. Device for analog-to-digital conversion of an analog voltage into a digital data stream, the device having resistors, in particular ohmic resistors, and a reconfigurable logic module, wherein the logic module has an input provided for differentially transmitted data signals, the input having a first terminal and a second terminal Connection, wherein the first terminal is supplied to the non-inverting input of a comparison means of the logic device and the second terminal of the inverting input of the comparison means, characterized in that the analog voltage between a zero potential, in particular ground, and a first resistor is applied, which with the first connection of the input is connected, Apparatus according to claim 10, characterized in that between the zero potential and the first terminal of the input, a capacitor is arranged. Apparatus according to claim 10 or 11, characterized in that the output signal of the comparison means is electrically connected to an externally contactable contact of the logic device, wherein the first terminal of the input and the contact are connected by means of a second resistor. Device according to one of claims 10 to 12, characterized in that the second terminal is connected by means of a third resistor to the zero potential. Device according to one of claims 10 to 13, characterized in that the reference voltage between a zero potential, in particular ground, and a fourth resistor is applied, which is connected to the second terminal of the input.

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