COMPENSATION CAPACITOR NETWORK FOR DIVIDED DIFFUSED RESISTORS FOR A VOLTAGE DIVIDER
First Claim
Patent Images
1. An integrated circuit comprising:
- a plurality of 2 or more diffused resistors arranged in series for a voltage divider, the voltage divider comprising;
an output node;
an input node coupled to an input voltage; and
a reference node coupled to a voltage reference;
a first diffused resistor having a first terminal and a second terminal, wherein the first diffused resistor is of a first semiconductor type and is disposed in a first well of a second semiconductor type, wherein the first terminal is coupled to the output node and wherein the second terminal of the third diffused resistor is coupled to the reference node;
one or more diffused resistors in series between the input node and the output node, the one or more diffused resistors comprising at least;
a second diffused resistor having a first terminal and a second terminal, wherein the second diffused resistor is of the first semiconductor type and is disposed in a second well of the second semiconductor type, wherein the first terminal and the second well are coupled to the input node, wherein the second terminal is coupled directly or indirectly to the output node and to the first terminal of the first diffused resistor;
at least one explicit capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the input node, and wherein the second terminal is coupled to another node such that the at least one explicit capacitor is in parallel with at least a portion of the one or more diffused resistors in series between the input node and the output node and is not in parallel with the first diffused resistor.
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Abstract
A voltage divider of a voltage regulator system is disclosed utilizing divided diffused resistors. In one embodiment, a feed-forward capacitor network is connected across the resistors and the voltage divider output. The feed-forward capacitor network allows the output to rise and fall quickly with a change in the voltage divider input. Accordingly, an improved frequency response should be obtained utilizing divided diffused resistors.
31 Citations
23 Claims
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1. An integrated circuit comprising:
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a plurality of 2 or more diffused resistors arranged in series for a voltage divider, the voltage divider comprising; an output node;
an input node coupled to an input voltage; and
a reference node coupled to a voltage reference;a first diffused resistor having a first terminal and a second terminal, wherein the first diffused resistor is of a first semiconductor type and is disposed in a first well of a second semiconductor type, wherein the first terminal is coupled to the output node and wherein the second terminal of the third diffused resistor is coupled to the reference node; one or more diffused resistors in series between the input node and the output node, the one or more diffused resistors comprising at least; a second diffused resistor having a first terminal and a second terminal, wherein the second diffused resistor is of the first semiconductor type and is disposed in a second well of the second semiconductor type, wherein the first terminal and the second well are coupled to the input node, wherein the second terminal is coupled directly or indirectly to the output node and to the first terminal of the first diffused resistor; at least one explicit capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the input node, and wherein the second terminal is coupled to another node such that the at least one explicit capacitor is in parallel with at least a portion of the one or more diffused resistors in series between the input node and the output node and is not in parallel with the first diffused resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 23)
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19. A method of fabricating an integrated circuit, the method comprising:
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forming a plurality of 2 or more diffused resistors arranged in series for a voltage divider, further comprising; forming a first diffused resistor having a first terminal and a second terminal, wherein the first diffused resistor is of a first semiconductor type and is disposed in a first well of a second semiconductor type, wherein the first terminal is coupled to an output node and wherein the second terminal of the third diffused resistor is coupled to a reference node, wherein the reference node is coupled to a voltage reference; forming one or more diffused resistors in series between an input node and the output node, wherein the input node is coupled to an input voltage, further comprising; forming a second diffused resistor having a first terminal and a second terminal, wherein the second diffused resistor is of the first semiconductor type and is disposed in a second well of the second semiconductor type, wherein the first terminal and the second well are coupled to the input node, wherein the second terminal is coupled directly or indirectly to the output node and to the first terminal of the first diffused resistor; forming at least one explicit capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the input node, and wherein the second terminal is coupled to another node such that the at least one explicit capacitor is in parallel with at least a portion of the one or more diffused resistors in series and is not in parallel with the first diffused resistor. - View Dependent Claims (20, 21, 22)
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Specification