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US 9,960,780 B1Granted
Current source noise cancellation
AssigneeTexas Instruments Incorporated
InventorsJagannathan Venkataraman, Eeshan Miglani
Life of this patent
Estimating the term…
Abstract
At least some embodiments are directed to a system that comprises a differential switch network comprising first and second output nodes, first and second transistors coupled to the network, and first and second resistors coupled to the first and second transistors. The DAC also comprises a voltage source coupled to the first resistor and a ground connection coupled to the second resistor. The DAC further includes a capacitor coupled to the first and second transistors and to the second resistor.
Claims19
A system, comprising:
- a differential switch network comprising first and second output nodes;
- first and second transistors coupled to the network;
- a first resistor coupled to the first transistor and a second resistor coupled to the second transistor;
- a voltage source coupled to the first resistor and a ground connection coupled to the second resistor;
- and
- a capacitor coupled to the first and second transistors and to the second resistor;
- further comprising a third resistor coupled to the capacitor and to the first transistor.
4 more elements
A system, comprising:
- a differential switch network comprising first and second output nodes;
- first and second transistors coupled to the network;
- a first resistor coupled to the first transistor and a second resistor coupled to the second transistor;
- a voltage source coupled to the first resistor and a ground connection coupled to the second resistor;
- and
- a capacitor coupled to the first and second transistors and to the second resistor;
- further comprising a second capacitor configured to switchably couple to the capacitor in parallel.
4 more elements
A system, comprising:
- a differential switch network comprising first and second output nodes;
- first and second transistors coupled to the network;
- a first resistor coupled to the first transistor and a second resistor coupled to the second transistor;
- a voltage source coupled to the first resistor and a ground connection coupled to the second resistor;
- and
- a capacitor coupled to the first and second transistors and to the second resistor;
- wherein the capacitor couples to a gate of the first transistor.
4 more elements
A system, comprising:
- a differential switch network comprising first and second output nodes;
- first and second transistors coupled to the network;
- a first resistor coupled to the first transistor and a second resistor coupled to the second transistor;
- a voltage source coupled to the first resistor and a ground connection coupled to the second resistor;
- and
- a capacitor coupled to the first and second transistors and to the second resistor;
- wherein the capacitor couples to a source of the second transistor.
4 more elements
A system, comprising:
- a differential switch network comprising first and second output nodes;
- first and second transistors coupled to the network;
- a first resistor coupled to the first transistor and a second resistor coupled to the second transistor;
- a voltage source coupled to the first resistor and a ground connection coupled to the second resistor;
- and
- a capacitor coupled to the first and second transistors and to the second resistor;
- wherein the differential switch network is configured to provide a first output current on the first output node and a second output current on the second output node, and wherein the first output current is proportional to the second output current by a predetermined factor K.
4 more elements
A system, comprising:
- a plurality of impedances, each of the impedances coupled to another one of the impedances;
- an output node positioned between a first and a second of the plurality of impedances;
- an input node positioned between the second and a third of the plurality of impedances;
- a resistor coupled to the first impedance;
- a capacitor coupled to the first impedance and to the third impedance;
- a fourth of the plurality of impedances coupled to the first impedance;
- and
- a fifth of the plurality of impedances coupled to the third impedance.
5 more elements
A system, comprising:
- a first current source comprising a first metal oxide semiconductor field effect transistor (MOSFET);
- a second current source including a second MOSFET and coupled to the first current source via a current output node;
- and
- a coupling circuit, positioned between the second MOSFET and the gate of the first MOSFET, that is configured to control current flow through the first MOSFET such that noise current flowing through the current output node is attenuated,
- wherein the coupling circuit comprises either an alternating current (AC) coupling circuit or a direct current (DC) coupling circuit.
2 more elements
Dependencies are inferred from the claim text.