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Dual bootstrapping for an open-loop pulse width modulation driver

A driver and bootstrap switch technology, applied in circuits, pulse technology, logic circuits, etc., can solve problems such as increasing total harmonic distortion and increasing the in-band noise floor of the driver

Active Publication Date: 2020-10-23
CIRRUS LOGIC INT SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of nonlinearities can increase total harmonic distortion and also cause high-frequency out-of-band noise to mix with in-band content, increasing the driver's in-band noise floor

Method used

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  • Dual bootstrapping for an open-loop pulse width modulation driver
  • Dual bootstrapping for an open-loop pulse width modulation driver
  • Dual bootstrapping for an open-loop pulse width modulation driver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 1 is a diagram of an example personal audio device 1 according to an embodiment of the disclosure. figure 1 Personal audio device 1 is depicted coupled to headphones 3 in the form of a pair of earbud speakers 8A and 8B. figure 1 The earphones 3 depicted in are examples only, and it should be understood that the personal audio device 1 may be used in connection with a variety of audio transducers, including but not limited to headphones, earbuds, earphones, and external speakers. The plug 4 may provide electrical terminals for connecting the earphone 3 to the personal audio device 1 . The personal audio device 1 may provide a display to the user and receive user input using the touch screen 2, or alternatively a standard liquid crystal display (LCD) may be integrated with various buttons, buttons, Sliders and / or dials combined. Such as figure 1 As shown, the personal audio device 1 may include an audio integrated circuit (IC) 9 for generating an analog audio s...

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PUM

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Abstract

A driver system may include a first n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a first terminal of a supply voltage and configured to drive the output when the first n-type field-effect transistor is activated, a second n-type field-effect transistor coupled at its non-gate terminals between an output of the driver system and a second terminal of the supply voltage and configured to drive the output when the second n-type field-effect transistor is activated, a high-side capacitor coupled to the output of the driver system, and alow-side capacitor coupled to the second terminal of the supply voltage, wherein the high-side capacitor and the low-side capacitor are configured to track and correct for mismatches between a firstresistance of the first n-type field-effect transistor and a second resistance of the second n-type field-effect transistor.

Description

technical field [0001] The present disclosure generally relates to circuits for audio and haptic devices, including but not limited to personal audio devices, such as wireless phones and media players, or devices that include haptic modules. Background technique [0002] Personal audio devices, including wireless phones (such as mobile / cellular phones), cordless phones, mp3 players, and other consumer audio devices, are in widespread use. Such personal audio equipment may include circuitry for driving a pair of headphones or one or more speakers. Such circuits typically include a power amplifier, which is used to drive the audio output signal to headphones or speakers. Generally speaking, power amplifiers amplify audio signals by taking energy from a power supply and manipulating the audio output signal to match the shape of the input signal but with greater amplitude. [0003] An example of an audio amplifier is a Class D amplifier. Class D amplifiers (also referred to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/183H03F3/217
CPCH03F3/183H03F3/2173G06F3/016H03K17/063H03K17/6871H04R3/12H03K19/017545H03K19/018557H03K19/0185
Inventor 白婧特贾斯维·达斯赵欣朱磊费晓凡
Owner CIRRUS LOGIC INT SEMICON