Transimpedance amplifier
AssigneeThermo Fisher Scientific (Bremen) GmbH
InventorHeinz Lerche
Life of this patent
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Abstract
A transimpedance amplifier includes a resistor assembly coupled between an output of the transimpedance amplifier and an input of the transimpedance amplifier, and a voltage source for applying a first voltage to a first conductive compensation element of the resistor assembly and a second voltage to a second conductive compensation element of the resistor assembly. The first voltage and the second voltage are each derived from the output voltage, Vout, of the transimpedance amplifier. The first voltage is a first proportion of Vout and the second voltage is a second proportion of Vout. The voltage source includes a voltage controller for adjusting at least one of the first proportion and/or the second proportion.
Claims29
A transimpedance amplifier comprising:
- a resistor assembly coupled between an output of the transimpedance amplifier and an input of the transimpedance amplifier, the resistor assembly comprising:
- a resistor having a longitudinal length, the resistor comprising:
- a resistive element;
- and
- an insulator surrounding the resistive element;
- and
- a plurality of conductive compensation elements each at least partially surrounding the insulator along at least part of the longitudinal length of the resistor;
- and
- a voltage source for applying a first voltage to a first conductive compensation element of the plurality of conductive compensation elements and a second voltage to a second conductive compensation element of the plurality of conductive compensation elements, wherein:
- the first voltage and the second voltage are each derived from the output voltage, Vout, of the transimpedance amplifier, the first voltage being a first proportion of Vout and the second voltage being a second proportion of Vout and wherein the voltage source comprises:
- a voltage controller for adjusting at least one of the first proportion and/or the second proportion.
A method of converting a current to a voltage using a transimpedance amplifier that comprises:
- a resistor assembly coupled between an output of the transimpedance amplifier and an input of the transimpedance amplifier, the resistor assembly comprising:
- a resistor having a longitudinal length, the resistor comprising:
- a resistive element;
- and
- an insulator surrounding the resistive element;
- and
- a plurality of conductive compensation elements each at least partially surrounding the insulator along at least part of the longitudinal length of the resistor;
- and
- a voltage source for applying a first voltage to a first conductive compensation element of the plurality of conductive compensation elements and a second voltage to a second conductive compensation element of the plurality of conductive compensation elements, wherein:
- the first voltage and the second voltage are each derived from the output of the transimpedance amplifier,
- the method comprising:
- applying the current to be converted to the input of the transimpedance amplifier such that a corresponding voltage is output at the output of the transimpedance amplifier, and
- applying the first voltage to the first conductive compensation element of the plurality of conductive compensation elements and the second voltage to a second conductive compensation element of the plurality of conductive compensation elements, wherein
- the first voltage and/or the second voltage have a magnitude(s) set to minimise the overshoot and undershoot of the output of the transimpedance amplifier in response to a change in the input current.
Dependencies are inferred from the claim text.