Resistor network for programmable transconductance stage
AssigneeTexas Instrumentsdeutschland GmbH
InventorViola Schaffer
Life of this patent
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Abstract
A voltage-to-current converter is provided. The voltage-to-current converter comprises an amplifier, a resistor network, an R-2R network, and switches. The amplifier has a first input node (which is an input signal), a second input node, and an output node. The resistor network is coupled to the output node of the amplifier, includes a plurality of resistors coupled in series with on another, and includes a plurality of first tap nodes. The R-2R network is coupled to the resistor network and includes a plurality of second tap nodes. Additionally, at least one switch is coupled between the second input node of the amplifier and each first tap node, and at least one switch is coupled between the second input node of the amplifier and each of the second tap nodes.
Claims11
An apparatus comprising:
- an amplifier having a first input node, a second input node, and an output node, wherein the amplifier receives an input signal at the first input node;
- a resistor network that is coupled to the output node of the amplifier, wherein the resistor network includes a plurality of resistors coupled in series with one another and a plurality of first tap nodes, wherein the resistor network further comprises five resistors, wherein the values of the five resistors are integer multiples of one another;
- an R-2R network that is coupled to the resistor network, wherein the R-2R network includes a plurality of second tap nodes;
- and
- a plurality of switches, wherein at least one switch is coupled between the second input node of the amplifier and each first tap node, and wherein at least one switch is coupled between the second input node of the amplifier and each of the second tap nodes.
An apparatus comprising:
- an amplifier having a first input node, a second input node, and an output node, wherein the amplifier receives an input signal at the first input node;
- a resistor network that is coupled to the output node of the amplifier, wherein the resistor network includes a plurality of resistors coupled in series with one another and a plurality of first tap nodes;
- an R-2R network that is coupled to the resistor network, wherein the R-2R network includes a plurality of second tap nodes;
- a plurality of switches, wherein at least one switch is coupled between the second input node of the amplifier and each first tap node, and wherein at least one switch is coupled between the second input node of the amplifier and each of the second tap nodes;
- and
- a current source that is coupled to the amplifier and that is adapted to provide current to the resister network and the R-2R network.
Dependencies are inferred from the claim text.