A class-D amplifier includes a differential integrator that integrates a difference between an input signal and a feedback signal to output an integration value signal, a pulse width modulation circuit that outputs a digital signal having a pulse width corresponding to a level of the integration value signal, an output buffer that drives a load based on the digital signal, a feedback section that feeds an output signal of the output buffer into the differential integrator as the feedback signal, a clamp section that performs a clamping of limiting the level of the integration value signal within a specified level range, an attenuation section that attenuates the level of the input signal to be input to the differential integrator in response to an attenuation command, and an attenuation control section that outputs the attenuation command to the attenuation section in response to the clamping performed by the clamp section.

Claims

7 · 1 independent · depth 3

7 granted claims

›1.independentA class-D amplifier comprising:na differential integrator that integrates a difference between an input signal and a feedback signal to output an inte…+6

›2.↳ 1The class-D amplifier according to claim 1, wherein the attenuation section has a switch which switches supply and shutoff of the input signal to the …d2

›3.↳ 1The class-D amplifier according to claim 1, wherein the pulse width modulation circuit compares a triangular wave signal with the integration value si…d2

›4.↳ 1The class-D amplifier according to claim 1, wherein the attenuation control section outputs the attenuation command to the attenuation section in resp…d2

›5.↳ 1The class-D amplifier according to claim 1, further comprising:na clamp level setting circuit that sets an upper limit clamp level and a lower limit c…d2+1

›7.↳ 1The class-D amplifier according to claim 1, further comprising:na response characteristic adjusting section that adjusts a response characteristic of …d2

Classifications

4 codes

IPC · International Patent Classification

Section H — Electricity

H03F3/217

USPC · US Patent Classification

330/251330/10330/207.A

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Pendency

1.3 y

460 days filing → grant

Office actions

none on record

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1 RCE

Examiner

Henry K Choe

art unit 2817 · TC 2800

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Citations: 6 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20100219891 A1	2 Sep 2010

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