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Frequency shaping noise in a dc-dc converter using pulse pairing

a technology of dc-dc converter and pulse pairing, which is applied in the direction of dc-dc conversion, power conversion system, and apparatus without intermediate ac conversion, etc., can solve the problems of difficult control of interference in radio frequency (rf) circuit, and achieve the effect of reducing interferen

Active Publication Date: 2018-05-17
SILICON LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively reduces interference at RF bands of interest by creating spectral nulls at specified frequencies, minimizing noise and maintaining efficient power delivery to RF circuits.

Problems solved by technology

However, one drawback of a PFM converter is that its switching operations can cause interference in radio frequency (RF) circuits that is difficult to control, since the interfering energy is spread over wide and unpredictable frequency bands.

Method used

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  • Frequency shaping noise in a dc-dc converter using pulse pairing
  • Frequency shaping noise in a dc-dc converter using pulse pairing
  • Frequency shaping noise in a dc-dc converter using pulse pairing

Examples

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Embodiment Construction

[0017]In various embodiments, control techniques are provided to reduce or remove interference at RF bands of interest caused by switching of a DC-DC converter. More specifically, embodiments may control PFM pulses by way of modest timing restrictions, so as to create one or more notches in a frequency spectrum at a specified frequency or range of frequencies. Specifically, in a preferred embodiment, a PFM DC-DC converter is controlled to not output a single pulse of a switching signal, but always to output at least a pair of pulses that have a predetermined delay interval between their start times.

[0018]Referring now to FIG. 1, shown is a schematic diagram of a DC-DC voltage converter in accordance with an embodiment. More specifically as shown in FIG. 1, voltage converter 100 is implemented as a DC-DC switching converter. Converter 100 may be adapted on-chip or off-chip depending upon implementation. To provide a load voltage (VLoad) to a load circuit 130 coupled in parallel with ...

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Abstract

In one aspect, an apparatus includes: a pulse frequency modulation (PFM) voltage converter to receive a first voltage and provide a second voltage to a load; and a pulse generator. The PFM voltage converter may include an inductor to store energy based on the first voltage and a switch controllable to switchably couple the first voltage to the inductor. The pulse generator may be configured to generate at least one pulse pair to control the switch, where this pulse pair is formed of a first pulse and a second pulse substantially identical to the first pulse, where the second pulse is separated from the first pulse by a pulse separation interval, when the second voltage is less than a first threshold voltage.

Description

BACKGROUND[0001]A DC-DC converter is a form of voltage converter that receives input of a DC voltage and modifies it to output a DC voltage of a different voltage level. Different topologies of converters enable boost and buck operations. DC-DC converters are desirable to use in powering portable devices such as wireless devices, since they can reduce the current drawn from a battery power supply. Many types of DC-DC converters exist, including pulse width modulation (PWM) converters and pulse frequency modulation (PFM) converters. Different converters may be preferable for certain applications. For example a PFM converter maximizes efficiency over a wider range of load currents than does a PWM DC-DC converter. However, one drawback of a PFM converter is that its switching operations can cause interference in radio frequency (RF) circuits that is difficult to control, since the interfering energy is spread over wide and unpredictable frequency bands.SUMMARY OF THE INVENTION[0002]In ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B14/02H02M3/04H04B1/12H02M1/44
CPCH04B14/026H02M1/44H04B1/123H02M3/04H02M1/08H02M1/12H02M7/48H02M3/158H04B15/06
Inventor KHOURY, JOHN M.
Owner SILICON LAB INC