Method and circuit for current integration
Assigneeams International AG
InventorFridolin Michel
Life of this patent
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Abstract
An input current (Iin) is transformed into an output integrated voltage (Vout_int) using a parallel connection of an operational transconductance amplifier and an integration capacitor. The output integrated voltage is reduced by repeatedly discharging the integration capacitor through a feedback loop via a digital-to-analog converter generating feedback pulses, a feedback clock period (Tclk_DAC) defining time intervals between successive rising edges of the feedback pulses. Sampling is performed during an extended feedback clock period (T*) after a lapse of a plurality of feedback clock periods (Tclk_DAC).
Claims15
A method of current integration, comprising:
- transforming an input current into an output integrated voltage using a parallel connection of an operational transconductance amplifier and an integration capacitor,
- reducing the output integrated voltage by repeatedly discharging the integration capacitor through a feedback loop via a digital-to-analog converter generating feedback pulses, a feedback clock period defining time intervals between successive rising edges of the feedback pulses, and
- sampling during an extended feedback clock period after a lapse of a plurality of feedback clock periods.
A method of current integration, comprising:
- transforming an input current into an output integrated voltage using a parallel connection of an operational transconductance amplifier and an integration capacitor,
- reducing the output integrated voltage by repeatedly discharging the integration capacitor through a feedback loop via a digital-to-analog converter generating feedback pulses,
- applying an electric power for the operational transconductance amplifier, and
- elevating the applied electric power only for sampling during a sampling time.
A circuit for current integration, comprising:
- a parallel connection of an integration capacitor, an operational transconductance amplifier and a feedback loop, the operational transconductance amplifier being configured to transform an input current into an output integrated voltage,
- a digital-to-analog converter in the feedback loop, the digital-to-analog converter being configured to generate feedback pulses triggering discharges of the integration capacitor, a feedback clock period defining time intervals between successive rising edges of the feedback pulses, and
- a controller configured to provide an extended feedback clock period after a lapse of a plurality of feedback clock periods.
Dependencies are inferred from the claim text.