Sigma-delta analogue to digital converter

A battery management system for a vehicle, wherein the battery management system comprises a sigma-delta ADC, wherein the sigma-delta ADC comprises:

• a first-input-terminal configured to receive a first-high-voltage-analogue-input-signal;
• a second-input-terminal configured to receive a second-high-voltage-analogue-input-signal;
• an output-terminal configured to provide an output-digital-signal, wherein the output-digital-signal is representative of the difference between the first-high-voltage-analogue-input-signal and the second-high-voltage-analogue-input-signal;
• a first-amplifier-stage comprising:
• a first-amplifier-first-input-terminal;
• a first-amplifier-second-input-terminal;
• a first-amplifier-first-output-terminal;
• a first-amplifier-second-output-terminal;
• a first-input-resistor connected in series between the first-input-terminal and the first-amplifier-first-input-terminal;
• a second-input-resistor connected in series between the second-input-terminal and the first-amplifier-second-input-terminal;
• a first-amplifier-first-transistor comprising:
• a control-terminal, that is connected to the first-amplifier-first-input-terminal and is configured to receive a high-voltage first-amplifier-first-input-signal;
• a first-conduction-channel-terminal, that is configured to be connected to a high-voltage supply;
• a second-conduction-channel-terminal, that is configured to provide a low-voltage signal for setting the voltage at the first-amplifier-first-output-terminal;
• a first-amplifier-second-transistor comprising:
• a control-terminal, that is connected to the first-amplifier-second-input-terminal and is configured to receive a high-voltage first-amplifier-second-input-signal;
• a first-conduction-channel-terminal, that is configured to be connected to a high-voltage supply;
• a second-conduction-channel-terminal, that is configured to provide a low-voltage signal for setting the voltage at the first-amplifier-second-output-terminal;
• and
• a first-integration-capacitor connected between the first-amplifier-first-output-terminal and the first-amplifier-first-input-terminal;
• a second-integration-capacitor connected between the first-amplifier-second-output-terminal and the first-amplifier-second-input-terminal;
• a threshold-block that is configured to:
• receive signals from the first-amplifier-first-output-terminal and the first-amplifier-second-output-terminal;
• and
• provide the output-digital-signal to the output-terminal;
• and
• a feedback-current-block, which comprises:
• a first-feedback-transistor having a conduction channel;
• a second-feedback-transistor having a conduction channel;
• a first-feedback-switch;
• a second-feedback-switch;
• a first-feedback-current-source;
• and
• a second-feedback-current-source;
• wherein:
• each of the following components is connected in series between the first-amplifier-first-input-terminal and a reference-terminal:
• the conduction channel of the first-feedback-transistor;
• the first-feedback-switch;
• and the first-feedback-current-source;
• and
• each of the following components is connected in series between the first-amplifier-second-input-terminal and the reference-terminal:
• the conduction channel of the second-feedback-transistor;
• the second-feedback-switch;
• and the second-feedback-current-source.

A vehicle comprising a battery management system, wherein the battery management system comprises a sigma-delta ADC, wherein the sigma-delta ADC comprises:

• a first-input-terminal configured to receive a first-high-voltage-analogue-input-signal;
• a second-input-terminal configured to receive a second-high-voltage-analogue-input-signal;
• an output-terminal configured to provide an output-digital-signal, wherein the output-digital-signal is representative of the difference between the first-high-voltage-analogue-input-signal and the second-high-voltage-analogue-input-signal;
• a first-amplifier-stage comprising:
• a first-amplifier-first-input-terminal;
• a first-amplifier-second-input-terminal;
• a first-amplifier-first-output-terminal;
• a first-amplifier-second-output-terminal;
• a first-input-resistor connected in series between the first-input-terminal and the first-amplifier-first-input-terminal;
• a second-input-resistor connected in series between the second-input-terminal and the first-amplifier-second-input-terminal;
• a first-amplifier-first-transistor comprising:
• a control-terminal, that is connected to the first-amplifier-first-input-terminal and is configured to receive a high-voltage first-amplifier-first-input-signal;
• a first-conduction-channel-terminal, that is configured to be connected to a high-voltage supply;
• a second-conduction-channel-terminal, that is configured to provide a low-voltage signal for setting the voltage at the first-amplifier-first-output-terminal;
• a first-amplifier-second-transistor comprising:
• a control-terminal, that is connected to the first-amplifier-second-input-terminal and is configured to receive a high-voltage first-amplifier-second-input-signal;
• a first-conduction-channel-terminal, that is configured to be connected to a high-voltage supply;
• a second-conduction-channel-terminal, that is configured to provide a low-voltage signal for setting the voltage at the first-amplifier-second-output-terminal;
• and
• a first-integration-capacitor connected between the first-amplifier-first-output-terminal and the first-amplifier-first-input-terminal;
• a second-integration-capacitor connected between the first-amplifier-second-output-terminal and the first-amplifier-second-input-terminal;
• a threshold-block that is configured to:
• receive signals from the first-amplifier-first-output-terminal and the first-amplifier-second-output-terminal;
• and
• provide the output-digital-signal to the output-terminal;
• and
• a feedback-current-block, which comprises:
• a first-feedback-transistor having a conduction channel;
• a second-feedback-transistor having a conduction channel;
• a first-feedback-switch;
• a second-feedback-switch;
• a first-feedback-current-source;
• and
• a second-feedback-current-source;
• wherein:
• each of the following components is connected in series between the first-amplifier-first-input-terminal and a reference-terminal:
• the conduction channel of the first-feedback-transistor;
• the first-feedback-switch;
• and the first-feedback-current-source;
• and
• each of the following components is connected in series between the first-amplifier-second-input-terminal and the reference-terminal:
• the conduction channel of the second-feedback-transistor;
• the second-feedback-switch;
• and the second-feedback-current-source.