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Amplifier

A technology of amplifiers and operational amplifiers, applied in the direction of differential amplifiers, DC-coupled DC amplifiers, etc., which can solve the problems of lack of volume perception and fast attenuation behavior

Inactive Publication Date: 2012-06-13
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some cases such control is not desired; when applied to e.g. sound installations, the decay behavior is so fast that the perception of volume is lacking

Method used

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  • Amplifier
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no. 1 example

[0026] A first embodiment of the present invention will be described with reference to the drawings. figure 1 is a circuit diagram showing the configuration of the amplifier 100 of the first embodiment. Such as figure 1 As shown in , the amplifier 100 includes a differential output operational amplifier 10 . Amplifier 100 also includes positive and negative input signal terminals and negative and positive output signal terminals. The amplifier 100 inputs a positive input signal Vi1 and a negative input signal Vi2, and outputs a negative output signal Vo1 and a positive output signal Vo2.

[0027] The differential output operational amplifier 10 includes a reference voltage terminal. The differential output operational amplifier 10 outputs a first output signal Va1 (negative) and a second output signal Va2 (positive) with the voltage supplied to the reference voltage terminal as an amplitude center. Since the reference voltage Vref is supplied to the reference voltage termi...

no. 2 example

[0097] A second embodiment according to the present invention will be described below. In the second embodiment of the present invention, those parts similar to the corresponding parts of the first embodiment are denoted by the same reference numerals, respectively, and description thereof will be omitted. Figure 4 is a circuit configuration diagram showing the configuration of an amplifier according to a second embodiment of the embodiment of the present invention.

[0098] According to the second embodiment, the comparator circuit 20 includes: comparators 21a' and 21b'; an OR circuit 22 which operates a logical sum of the output signals of the corresponding comparators; and a detection level setting circuit 23 whose output is used for Compare the voltage. When the voltage V1 of the positive input terminal Vin+ of the differential output operational amplifier 10 has exceeded the voltage Vcmp for comparison output by the detection level setting circuit 23, the comparator 21a...

no. 3 example

[0122] see Figure 6 A third embodiment according to the present invention will be described. In the third embodiment of the present invention, those parts similar to the corresponding parts of the first and second embodiments are denoted by the same reference numerals, respectively, and description thereof will be omitted. Specifically, the amplifier 100 and the comparator circuit 20 according to the third embodiment may use any of those according to the first or second embodiment. Figure 6 is a circuit configuration diagram showing the configuration of an amplifier according to a third embodiment of the embodiment of the present invention.

[0123]According to the third embodiment, a voltage-controlled attenuator (VCA) 40 (input level controller) for attenuating the input signals Vinput1 and Vinput2 is provided as a preceding stage of the amplifier 100 . The detection signal Vdet output from the comparator circuit 20 is input to the VCA40 to control the VCA40. For exampl...

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Abstract

An amplifier includes: an operation amplifier including a positive input terminal and a negative input terminal; and a detector which detects that a difference between a voltage of the positive input terminal and a voltage of the negative input terminal is equal to or exceeds a predetermined value and outputs a detection signal.

Description

technical field [0001] The present invention relates to amplifiers, and in particular, to amplifiers capable of detecting the occurrence of a desired degree of clipping. Background technique [0002] Traditionally, amplifiers are configured to prevent clipping due to excessive input by attenuating the input signal when it is detected that the output voltage has exceeded a predetermined voltage value, such as the supply voltage value. Since it is not possible to accurately determine whether clipping is actually occurring through output voltage detection, a technique for reliably detecting the occurrence of clipping and attenuating an input signal is disclosed in Japanese Published Unexamined Patent Application No. H10-163769 . [0003] The techniques described above focus on preventing the occurrence of clipping and are therefore configured to detect clipping and attenuate the input signal should clipping occur or is likely to occur. However, in some cases such control is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
Inventor 土屋裕利
Owner YAMAHA CORP