Patent ID: 11949417
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Control (Instruments)
Classification: CPC H  G | IPC G  H

Claim 13:
14. An oscillator including a current source, the current source comprising:
a bias circuit including a first current;
a first trimmable resistor and a second trimmable resistor coupled to the bias circuit;
a trim system configured to measure the first current and determine an offset based on the first current; and
a trim control coupled to the trim system and the first trimmable resistor and the second trimmable resistor, the trim control configured to trim the first trimmable resistor based on the offset;
wherein the first trimmable resistor and the second trimmable resistor each include: a fixed resistor; a plurality of resistors; and a first plurality of switches, each of the first plurality of switches is coupled to a respective one of the plurality of resistors;
wherein the bias circuit is coupled to the trim control, further wherein the bias circuit includes the first current coupled to the first trimmable resistor and a second current coupled to the second trimmable resistor and wherein the bias circuit further includes: a plurality of transistors coupled in parallel and a second plurality of switches, and wherein each of the second plurality of switches is coupled to a respective drain of the plurality of transistors.