Feed forward compensation of parasitic capacitance in a device frontend
AssigneeFluke Corporation
InventorJeffrey D. Graw
Life of this patent
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Abstract
Feed forward compensation of parasitic capacitance in a device frontend is provided. A feed forward element is positioned along at least a portion of a length of a first input resistance and a distance away from the first input resistance. In some implementations, the feed forward element has a width that is increasing along the at least a portion of the length of the first input resistance. The feed forward element is operative to introduce an element capacitance that offsets a parasitic capacitance in a volume surrounding the first input resistance.
Claims19
A frontend of a measurement device, comprising:
- a circuit board;
- a first input resistance coupled between an input node and a tap node and positioned on the circuit board, the first input resistance having a length and being configured to receive an input voltage at the input node and provide a divided voltage at the tap node;
- and
- a feed forward element coupled to the tap node and positioned along at least a portion of the length of the first input resistance and a distance away from the first input resistance, the feed forward element being operative to introduce an element capacitance that offsets a parasitic capacitance in a volume between the feed forward element and the first input resistance.
A measurement device, comprising:
- a frontend including:
- a circuit board;
- a first input resistance coupled between an input node and a tap node and positioned on the circuit board, the first input resistance having a length and being configured to receive an input signal at the input node and provide a first signal at the tap node;
- and
- a feed forward element coupled to the tap node and positioned along at least a portion of the length of the first input resistance and a distance away from the first input resistance, the feed forward element being operative to introduce an element capacitance that offsets a parasitic capacitance in a volume between the feed forward element and the first input resistance;
- and
- circuitry, coupled to the tap node, configured to:
- detect, at the tap node, the first signal representative of the input signal at the input node;
- and
- based on the detected first signal, determine at least one electrical quantity of the input signal.
A method, comprising:
- inducing an element capacitance between a first input resistance and a feed forward element positioned along at least a portion of a length of the first input resistance, the first input resistance being coupled between an input node configured to receive an input voltage and a tap node configured to provide a divided voltage, the feed forward element being positioned a distance away from the first input resistance, and the feed forward element being coupled to the tap node;
- and
- offsetting, using the element capacitance, a parasitic capacitance in a volume between the feed forward element and the first input resistance.
Dependencies are inferred from the claim text.