US 11,799,698 B2Granted

Pulse-amplitude modulation transceiver, field device and method for operating the pulse-amplitude modulation transceiver

AssigneeEndress + Hauser Flowtec AG

InventorsJannis Kappertz, Alexander Stutz, Markus Wucher

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Abstract

A PAM transceiver configured to process an electrical data signal having at least three states includes an electronic circuit comprising: a data interface configured to connect to a duplex communication channel; a first circuit section connected to the data interface; and a second circuit section connected to the data interface. The first circuit section includes an equalizer for compensating for distortions in the data signal and an interpreter downstream of the equalizer for recognizing symbols. The second circuit section includes a delay unit for time-shifting the data signal and an MMA processor for recognizing a signal phase of the data signal. The first circuit section and the second circuit sections are routed to the MMA processor. The second circuit section has a finite impulse response filter configured to monotonize an impulse response of the communication channel.

Claims12

Dependent claims

A pulse amplitude modulation (PAM) transceiver configured to process a received electrical data signal having at least two states, wherein the data signal comprises a sequence of states, each state representing an information symbol and a pulse of the data signal is assigned to each symbol, the PAM transceiver comprising:

an electronic circuit including a first circuit section and a second circuit section;
a data interface configured to connect to a duplex communication channel and configured to digitize the data signal, the data interface including an analog/digital converter configured to digitize the data signal received by the data interface and to supply the digitized data signal to the first circuit section and to the second circuit section;
wherein the first circuit section is connected to the data interface and the first circuit section includes:
an equalizer to compensate for distortions in the data signal caused by the communication channel;
and
an interpreter arranged downstream of the equalizer for recognizing symbols transmitted by the data signal;
wherein the second circuit section is connected to the data interface and the second circuit section includes:
a delay unit for time-shifting the data signal;
and
an adjustable finite impulse response filter connected to an output of the delay unit and configured to symmetrize an impulse response of the communication channel;
and
a Mueller-Müller algorithm (MMA) processor for recognizing a signal phase of the data signal, the MMA processor having a first input and a second input, wherein an output of the interpreter of the first circuit section is connected to the first input and an output of the adjustable finite impulse response filter of the second circuit section is connected to the second input.

9 more elements

A field device of measurement/automation technology, comprising:

a transducer for capturing a measured variable and outputting a measurement signal corresponding to the measured variable;
an electronic measuring/operating circuit for operating the measuring transducer, for evaluating the measurement signal, and outputting measurement values of the measured variable;
a pulse amplitude modulation (PAM) transceiver configured to process a received electrical data signal having at least two states, wherein the data signal comprises a sequence of states, each state representing an information symbol and a pulse of the data signal is assigned to each symbol, the PAM transceiver comprising:
an electronic circuit including a first circuit section and a second circuit section;
a data interface configured to connect to a duplex communication channel and configured to digitize the data signal, the data interface including an analog/digital converter configured to digitize the data signal received by the data interface and to supply the digitized data signal to the first circuit section and to the second circuit section;
wherein the first circuit section is connected to the data interface and the first circuit section includes:
an equalizer to compensate for distortions in the data signal caused by the communication channel;
and
an interpreter arranged downstream of the equalizer for recognizing symbols transmitted by the data signal;
wherein the second circuit section is connected to the data interface and the second circuit section includes:
a delay unit for time-shifting the data signal;
and
an adjustable finite impulse response filter connected to an output of the delay unit and configured to symmetrize an impulse response of the communication channel;
and
a Mueller-Müller algorithm (MMA) processor for recognizing a signal phase of the data signal, the MMA processor having a first input and a second input, wherein an output of the interpreter of the first circuit section is connected to the first input and an output of the adjustable finite impulse response filter of the second circuit section is connected to the second input;
and
a housing for housing the electronic measuring/operating circuit and PAM transceiver,
wherein the field device is configured to transmit and/or receive the data signal via the PAM transceiver.

15 more elements

A method for synchronizing a pulse amplitude modulation (PAM) transceiver with an incoming data signal, the method comprising:

providing a pulse amplitude modulation (PAM) transceiver configured to process a received electrical data signal having at least two states, wherein the data signal comprises a sequence of states, each state representing an information symbol and a pulse of the data signal is assigned to each symbol, the PAM transceiver comprising:
an electronic circuit including a first circuit section and a second circuit section;
a data interface configured to connect to a duplex communication channel and configured to digitize the data signal, the data interface including an analog/digital converter configured to digitize the data signal received by the data interface and to supply the digitized data signal to the first circuit section and to the second circuit section;
wherein the first circuit section is connected to the data interface and the first circuit section includes:
an equalizer to compensate for distortions in the data signal caused by the communication channel;
and
an interpreter arranged downstream of the equalizer for recognizing symbols transmitted by the data signal;
wherein the second circuit section is connected to the data interface and the second circuit section includes:
a delay unit for time-shifting the data signal;
and
an adjustable finite impulse response filter connected to an output of the delay unit and configured to symmetrize an impulse response of the communication channel;
and
a Mueller-Müller algorithm (MMA) processor for recognizing a signal phase of the data signal, the MMA processor having a first input and a second input, wherein an output of the interpreter of the first circuit section is connected to the first input and an output of the adjustable finite impulse response filter of the second circuit section is connected to the second input;
comparing states that are interpreted by the interpreter and associated with respective pulses, with non-interpreted states associated with corresponding pulses and, in the absence of a match, varying equalization parameters adaptively and thereby creating a match in a first method step;
determining the three coefficients of the filter by means of adjusted equalization parameters of the equalizer in a second method step;
and
synchronizing the PAM transceiver with the incoming data signal by means of the MMA processor in a third method step.

14 more elements

Dependencies are inferred from the claim text.