Compensation of baseline wander
AssigneeAnalog Devices Global
InventorMiguel Ángel Fernández Robayna
Life of this patent
Estimating the term…
Abstract
A circuit for compensation of baseline voltage wander operating at an input of an isolator is disclosed. The circuit can compensate electronically the frequency response of an isolation circuit (e.g., a transformer) by increasing the pass band in the low frequency region in order to minimize the baseline wander caused by low inductance windings. The compensation circuit can be used to inject a current ramp proportional to the amplitude and the duration of the pulse and inversely proportional to the open circuit inductance of the isolation circuit.
Claims20
A circuit for compensation of baseline voltage wander at an input of an isolator, the circuit comprising:
- a filter circuit, wherein the filter circuit is configured to receive an input voltage signal and generate a filtered representation of the input voltage signal;
- and
- a driver circuit configured to use information about a voltage magnitude extracted from the filtered representation of the input voltage signal to generate an output current ramp signal, and the driver circuit is further configured to inject the output current ramp signal into the input of the isolator to reduce or suppress voltage droop in the input voltage signal, wherein the input voltage signal and the output current ramp signal are both applied to the input of the isolator.
A compensation loop circuit for compensation of baseline voltage wander at an input of an isolator, the circuit comprising:
- a filter circuit coupled to an input of the isolator, the filter circuit configured to receive an input voltage signal from the input of the isolator and generate a filtered representation of the voltage signal;
- a gain circuit coupled to an output of the filter circuit, the gain circuit configured to amplify the filtered representation of the voltage signal to generate an amplified voltage signal;
- and
- a driver circuit coupled to an output of the gain circuit and an input of the filter circuit to form the compensation loop circuit, the driver circuit configured to generate an output current ramp signal based on the amplified voltage signal,
- wherein the driver circuit is further configured to inject the output current ramp signal into the input of the isolator to reduce or suppress voltage droop in the input voltage signal, wherein the input voltage signal and the output current ramp signal are both applied to the input of the isolator, and
- wherein the output current ramp signal is configurable based on a voltage gain associated with the input voltage signal and an output voltage signal corresponding to the output current ramp signal.
A method for generating a signal to compensate baseline voltage wander, the method comprising:
- receiving an input voltage signal from an input of an isolator circuit;
- filtering the received input voltage signal to generate a filtered representation of the input voltage signal;
- generating a current ramp signal proportional to inductance associated with the isolator circuit and a voltage magnitude extracted from the filtered representation of the input voltage signal;
- and
- injecting the current ramp signal into the input of the isolator to reduce or suppress voltage droop in the input voltage signal, wherein the input voltage signal and the current ramp signal are both applied to the input of the isolator.
Dependencies are inferred from the claim text.