Precision oscillators that use imprecise components
AssigneeTexas Instruments Incorporated
InventorsAniruddha ROY, Nitin AGARWAL, Rajavelu THINAKARAN
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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, 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 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.
An oscillator comprising:
- a trim-capable current source configured to:
- trim one or more resistance values that affects a first portion current of a capacitor charging current generated from the trim-capable current source;
- 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.
A method comprising:
- trimming, for a relaxation oscillator, one or more resistance values that affects a first portion current of a capacitor charging current generated from a trim-capable current source located within the relaxation oscillator;
- trimming, for the relaxation oscillator, 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, for the relaxation oscillator, a trim-capable capacitor to perform capacitor switching that controls a charge time of the trim-capable capacitor.
Dependencies are inferred from the claim text.