Trimming technique for oscillators
AssigneeNordic Semiconductor ASA
InventorLukasz FARIAN
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Abstract
According to an aspect, there is provided a swing-boosted differential oscillator and a method for trimming the oscillator. The oscillator comprises a switch (110) for connecting a set of capacitors (C1, C2) alternately to power supply and ground (102, 112) based on a switching control (116A, 116B), a comparator (114) configured to produce the switching control (116A, 116B) by comparing a voltage of the capacitors (C1, C2) at the inputs (VC1, VC2) of the comparator to a preset threshold voltage, and a trimmable resistor (RCAL) connecting the inputs (VC1, VC2) of the comparator, the resistor controlling the frequency of the output (118) of the oscillator.
Claims9
A swing-boosted differential oscillator, comprising
- a switch for connecting a set of capacitors alternately to poles of a direct current source based on a switching control,
- a comparator configured to produce the switching control by comparing a voltage of the capacitors at the inputs of the comparator to a preset threshold voltage,
- a trimmable resistor connecting the inputs of the comparator, the resistor controlling the frequency of the output of the oscillator.
A method for trimming a swing-boosted differential oscillator, comprising connecting by a switch a set of capacitors alternately to poles of a direct current source based on a switching control,
- producing by a comparator the switching control by comparing a voltage of the capacitors at the inputs of the comparator to a preset threshold voltage,
- controlling the frequency of the output of the oscillator by a trimmable resistor connecting the inputs of the comparator.
Dependencies are inferred from the claim text.