CAPACITIVE VOLTAGE DIVIDER
First Claim
1. A capacitive voltage divider arrangement comprising a first voltage divider and a second voltage divider, a first parasitic capacitance and a second parasitic capacitance being formed between the first capacitive voltage divider and the second capacitive voltage divider,the first capacitive voltage divider comprising:
- a terminal for a signal;
a first capacitance, via which the terminal may be coupled to a reference potential;
a second capacitance; and
a third capacitance that may be coupled to the reference potential, the second capacitance being coupled in between the terminal and the third capacitance; and
the second capacitive voltage divider comprising;
a first compensation capacitance, via which the terminal may be coupled to the reference potential, the first compensation capacitance further being coupled to the terminal via the first parasitic capacitance;
a second compensation capacitance; and
a third compensation capacitance that may be coupled to the reference potential, the second compensation capacitance being coupled in between the terminal and the third compensation capacitance, and the second parasitic capacitance coupling the third capacitance, at a terminal coupled to the second capacitance, to the third compensation capacitance, at a terminal coupled to the second compensation capacitance.
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Accused Products
Abstract
A capacitive voltage divider arrangement comprising a first and second voltage divider, a first and second parasitic capacitance being formed between the first and second capacitive voltage divider. The first capacitive voltage divider comprises a signal terminal; a first capacitance for coupling the terminal to a reference potential; a second capacitance; a third capacitance that may be coupled to the reference potential, the second capacitance being coupled in between the terminal and third capacitance. The second capacitive voltage divider comprises a first compensation capacitance for coupling the terminal to the reference potential, the first compensation capacitance further coupled to the terminal via the first parasitic capacitance; a second compensation capacitance; a third compensation capacitance that may be coupled to the reference potential, the second compensation capacitance coupled in between the terminal and third compensation capacitance, and the second parasitic capacitance coupling the third capacitance to the third compensation capacitance.
14 Citations
12 Claims
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1. A capacitive voltage divider arrangement comprising a first voltage divider and a second voltage divider, a first parasitic capacitance and a second parasitic capacitance being formed between the first capacitive voltage divider and the second capacitive voltage divider,
the first capacitive voltage divider comprising: -
a terminal for a signal; a first capacitance, via which the terminal may be coupled to a reference potential; a second capacitance; and a third capacitance that may be coupled to the reference potential, the second capacitance being coupled in between the terminal and the third capacitance; and the second capacitive voltage divider comprising; a first compensation capacitance, via which the terminal may be coupled to the reference potential, the first compensation capacitance further being coupled to the terminal via the first parasitic capacitance; a second compensation capacitance; and a third compensation capacitance that may be coupled to the reference potential, the second compensation capacitance being coupled in between the terminal and the third compensation capacitance, and the second parasitic capacitance coupling the third capacitance, at a terminal coupled to the second capacitance, to the third compensation capacitance, at a terminal coupled to the second compensation capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An analog-to-digital converter comprising a capacitive voltage divider arrangement, the capacitive voltage divider arrangement comprising a first voltage divider and a second voltage divider, a first parasitic capacitance and a second parasitic capacitance being formed between the first capacitive voltage divider and the second capacitive voltage divider,
the first capacitive voltage divider comprising: -
a terminal for a signal; a first capacitance, via which the terminal may be coupled to a reference potential; a second capacitance; and a third capacitance that may be coupled to the reference potential, the second capacitance being coupled in between the terminal and the third capacitance; and the second capacitive voltage divider comprising; a first compensation capacitance, via which the terminal may be coupled to the reference potential, the first compensation capacitance further being coupled to the terminal via the first parasitic capacitance; a second compensation capacitance; and a third compensation capacitance that may be coupled to the reference potential, the second compensation capacitance being coupled in between the terminal and the third compensation capacitance, and the second parasitic capacitance coupling the third capacitance, at a terminal coupled to the second capacitance, to the third compensation capacitance, at a terminal coupled to the second compensation capacitance. - View Dependent Claims (10, 11)
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12. A digital-to-analog converter comprising an analog-to-digital converter, the analog-to-digital converter comprising a capacitive voltage divider arrangement, the capacitive voltage divider arrangement comprising a first voltage divider and a second voltage divider, a first parasitic capacitance and a second parasitic capacitance being formed between the first capacitive voltage divider and the second capacitive voltage divider,
the first capacitive voltage divider comprising: -
a terminal for a signal; a first capacitance, via which the terminal may be coupled to a reference potential; a second capacitance; and a third capacitance that may be coupled to the reference potential, the second capacitance being coupled in between the terminal and the third capacitance; and the second capacitive voltage divider comprising; a first compensation capacitance, via which the terminal may be coupled to the reference potential, the first compensation capacitance further being coupled to the terminal via the first parasitic capacitance; a second compensation capacitance; and a third compensation capacitance that may be coupled to the reference potential, the second compensation capacitance being coupled in between the terminal and the third compensation capacitance, and the second parasitic capacitance coupling the third capacitance, at a terminal coupled to the second capacitance, to the third compensation capacitance, at a terminal coupled to the second compensation capacitance, further comprising a first switch matrix, a second switch matrix, an SAR control logic (SAR=successive-approximation register), a sample-and-hold element, and a comparator.
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Specification