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US 10,763,832 B2Granted
Precision oscillators that use imprecise components
AssigneeTexas Instruments Incorporated
InventorsAniruddha Roy, Nitin Agarwal, Rajavelu Thinakaran
Life of this patent
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Abstract
Trimming components within an oscillator comprising: a trim-capable current source, wherein the trim-capable current source comprises a trimmable resistor and a trimmable current component, a comparator comprising a first input terminal that couples to the trim-capable current source and the second input terminal that couples to a reference voltage source, a switch coupled to the first input terminal and the trim-capable current source, and a trim-capable capacitor coupled to the switch, wherein the switch is coupled between the trim-capable capacitor and the trim-capable current source.
Claims20
An oscillator comprising:
- a trim-capable current source that comprises:
- a trimmable resistor;
- a trimmable current component;
- a mirror transistor coupled to mirror a current through the trimmable resistor;
- and
- a trim component coupled to the mirror transistor and operable to:
- measure the current through the trimmable resistor;
- and
- determine, based on the current through the trimmable resistor, an offset between a resistance of the trimmable resistor and a target resistance, wherein the trim-capable current source is operable to change the resistance of the trimmable resistor in response to the offset;
- a comparator comprising a first input terminal that couples to the trim-capable current source and a second input terminal that couples to a reference voltage source;
- a switch coupled to the first input terminal and the trim-capable current source;
- and
- a trim-capable capacitor coupled to the switch, wherein the switch is coupled between the trim-capable capacitor and the trim-capable current source, and wherein the first input terminal of the comparator is electrically disconnected from the trim-capable capacitor when the switch is in a non-conductive state.
10 more elements
An oscillator comprising:
- a trim-capable current source that comprises:
- a trimmable resistor;
- a trimmable current component;
- a mirror transistor coupled to mirror a current through the trimmable resistor;
- and
- a trim component coupled to the mirror transistor and operable to:
- measure the current through the trimmable resistor;
- and
- determine, based on the current through the trimmable resistor, an offset between a resistance of the trimmable resistor and a target resistance, wherein the trim-capable current source is operable to change the resistance of the trimmable resistor in response to the offset;
- a first comparator comprising a first input terminal that couples to the trim-capable current source and a second input terminal that couples to a reference voltage source;
- a first switch coupled to the first input terminal and the trim-capable current source;
- a first trim-capable capacitor coupled to the first switch, wherein the first switch is coupled between the first trim-capable capacitor and the trim-capable current source;
- a second comparator comprising a third input terminal and a fourth input terminal, wherein the fourth input terminal is coupled to the reference voltage source;
- and
- a second switch coupled between the trim-capable current source and the third input terminal of the second comparator.
12 more elements
An oscillator comprising:
- a trim-capable current source configured to:
- measure a current through a variable resistor that affects a first portion current of a capacitor charging current generated from the trim-capable current source;
- determine, from the current, a resistance of the variable resistor;
- determine an offset between the resistance of the variable resistor and a target resistance;
- trim, based on the offset, the resistance of the variable resistor;
- and
- trim the first portion current to adjust a proportion of the first portion current in the capacitor charging current generated from the trim-capable current source;
- a comparator comprising a first input terminal that couples to the trim-capable current source and a second input terminal that couples to a reference voltage source;
- and
- a trim-capable capacitor coupled to the first input terminal, wherein the trim-capable capacitor is configured to perform capacitor switching that controls a charge time of the trim-capable capacitor.
7 more elements
A method comprising:
- measuring a current through a trimmable resistor of an oscillator, wherein the trimmable resistor affects a first portion current of a capacitor charging current generated from a trim-capable current source of the oscillator;
- determining an offset between the current through the trimmable resistor and a target resistance;
- trimming the resistance of the trimmable resistor;
- trimming the first portion current to adjust a proportion of the first portion current in the capacitor charging current generated from the trim-capable current source, wherein the capacitor charging current is a combination of the first portion current and a second portion current;
- and
- trimming a trim-capable capacitor to perform capacitor switching that controls a charge time of the trim-capable capacitor.
3 more elements
Dependencies are inferred from the claim text.