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

Claim 7:
8. An oscillator comprising:
a trimmable capacitor;
a trimmable current source coupled to the trimmable capacitor, wherein the trimmable current source includes:
a first trimmable resistor and a second trimmable resistor, and wherein the first trimmable resistor and the second trimmable resistor each include: a fixed resistor; a plurality of resistors; and a plurality of switches, each of the plurality of switches is coupled to a respective one of the plurality of resistors; and
a bias circuit coupled to a trim control, wherein the bias circuit includes a first portion current coupled to the first trimmable resistor and a second portion current coupled to the second trimmable resistor;

a comparator coupled to the trimmable current source, the comparator including a comparator output and
a data storage element coupled to the comparator output, the data storage element including one of a flip-flop and a latch, wherein the trimmable current source includes:
a first amplifier coupled to a first transistor, the first transistor coupled to the second portion current and the second trimmable resistor;
a second amplifier coupled to a second transistor, the second transistor coupled to the second trimmable resistor; and
a third amplifier coupled to a third transistor, the third transistor coupled to the first portion current and the first trimmable resistor.