POP AND CLICK NOISE REDUCTION

• US 20160248410A1
• Filed: 12/29/2015
• Published: 08/25/2016
• Est. Priority Date: 07/10/2011
• Status: Active Grant

• Current Assignee: Triune Systems, LLC (Semtech Corporation)
• Original Assignee: Triune Systems, LLC (Semtech Corporation)
• Inventors: Teggatz, Ross E., Chen, Wayne T., Smith, Brett
• Granted Patent: US 9,843,314 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03F 1/305 in case of switching on or off of a power supply
• CPC Class Codes: H03F 2200/03 the amplifier being designed for audio applications
• CPC Class Codes: H03F 3/181 Low-frequency amplifiers, e.g. audio preamplifiers
• CPC Class Codes: H03F 3/2173 of the bridge type
• CPC Class Codes: H03K 17/687 the devices being field-effect transistors
• CPC Class Codes: H03K 5/1252 Suppression or limitation of noise or interference specially adapted for transmission systems H04B15/00, H04L25/08
• CPC Class Codes: H04R 3/007 Protection circuits for transducers

Abstract

Disclosed are advances in the arts with novel and useful electronic circuitry with pop and click noise reduction. A load circuit is connected with a full or single-ended half-H bridge circuit and another circuit mechanism in a configuration by which a signal may be used to selectably bring the load circuit terminals to a selected voltage level when an externally applied signal is not present.

Claims

1-29. -29. (canceled)

30. An electronic circuit comprising:

a bridge circuit having an output node operably coupled with a first load terminal and a feedback node operably coupled with a second load terminal;

an op amp operably coupled to receive an input signal and to supply an output signal to the feedback node;

wherein the op amp output signal is configured to bring the terminals of the load circuit to a selected voltage level; and

wherein the op amp is configured to receive a feedback input from one of the load terminals and to turn off when the voltage level at the load circuit is not zero.

31. The electronic circuit of claim 30 wherein the op amp is configured to receive feedback input from a load terminal and to turn off when the load receives a signal at the output node of the bridge circuit.

32. The electronic circuit of claim 30 wherein the bridge circuit further comprises a single-ended half-H bridge circuit.

33. The electronic circuit of claim 30 wherein the op amp receives feedback input from the output node.

34. The electronic circuit of claim 30 wherein the op amp receives feedback input from the feedback node.

35. The electronic circuit of claim 30, wherein the selected voltage level comprises a mid-rail level.

36. The electronic circuit of claim 30 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp.

37. The electronic circuit of claim 30 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp, the wave-shape circuit further comprising an RC network.

38. The electronic circuit of claim 30 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp, the wave-shape circuit further comprising a digital-to-analog converter controllable to output a specific voltage signal shape.

39. An electronic circuit comprising:

a bridge circuit having an output node operably coupled with a first load circuit terminal and a feedback node operably coupled with a second load circuit terminal;

an op amp operably coupled to receive an input signal and to supply an output signal to the output node;

wherein the op amp output signal is configured to bring the terminals of the load circuit to a selected voltage level; and

wherein the op amp receives a feedback input from one of the terminals of the load circuit and turns off when the voltage level at the load circuit is not zero.

40. The electronic circuit of claim 39 wherein the op amp is configured to receive feedback input from a load terminal and to turn off when the load circuit receives a signal at the output node of the bridge circuit.

41. The electronic circuit of claim 39 wherein the op amp is configured to receive feedback input from the output node.

42. The electronic circuit of claim 39 wherein the op amp is configured to receive feedback input from the feedback node.

43. The electronic circuit of claim 39, wherein the selected voltage level comprises a mid-rail level.

44. The electronic circuit of claim 39 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp.

45. The electronic circuit of claim 39 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp, the wave-shape circuit further comprising an RC network.

46. The electronic circuit of claim 39 further comprising a wave-shape circuit operably coupled for providing an input signal to the op amp, the wave-shape circuit further comprising a digital-to-analog converter controllable to output a specific voltage signal shape.

47. The electronic circuit of claim 39 wherein the load circuit further comprises a speaker element.

48. An electronic circuit comprising:

a bridge circuit having an output node operably coupled with a first load terminal and a feedback node operably coupled with a second load terminal;

a first op amp operably coupled to receive an input signal and to supply an output signal to the bridge circuit feedback node and to supply the same output signal as a input signal to a second op amp coupled for providing an output signal to the bridge circuit output node;

wherein the respective op amp output signals are configured to bring the load terminals to a selected voltage level without transiting a load;

wherein the first op amp is configured to receive a feedback input from the bridge circuit feedback node and to turn off when the voltage level at the node is not zero

and the second op amp is configured to receive a feedback input from the output node and to turn off when the voltage level at the node is not zero.

49. The electronic circuit of claim 48 wherein the op amp is configured to receive a feedback input from a load terminal and to turn off when the load receives a signal at the output node of the bridge circuit.