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Signal amplifying circuit

A signal amplifying circuit and signal technology, applied in amplifiers, amplifier types, low-frequency amplifiers, etc., can solve the problems of high area manufacturing cost, large occupation, complex circuit structure, etc., and achieve the effect of saving DC power supply

Inactive Publication Date: 2016-10-05
UPI SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to adjust the DC voltage level of the single-ended output signal Vout output by the output amplifier 410 to zero, the output amplifier 410 needs to cooperate with the signal voltage level adjustment circuit 540b with a rather complex structure to operate, so that the output of the output amplifier 410 The displacement of (current Ios*resistance R) generated by the DC voltage level of the single-ended output signal Vout leads to an overly complicated circuit structure of the traditional signal output amplifier circuit, which not only occupies a large area but also has a high manufacturing cost

Method used

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Embodiment Construction

[0070] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, elements / members with the same or similar numbers used in the drawings and embodiments are used to represent the same or similar parts. In the following embodiments, when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intervening elements or specific materials (Example: glue or solder).

[0071] A preferred embodiment according to the present invention is a signal amplifying circuit. In this embodiment, the above-mentioned signal amplifying circuit can be applied to an audio codec (Audio Codec) or an independent audio codec (Audio Codec) installed in a power management integrated circuit (PowerManagement Integrated Circuit, PMIC) for Converts a differential audio input signal into, but not lim...

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Abstract

A signal amplifying circuit includes an operational amplifying module, a level adjusting module, and a voltage module. The operational amplifying module has a first input terminal, a second input terminal, and an output terminal. The output terminal outputs a single-ended output signal having a level of zero. The level adjusting module has a control node and coupled to the first input terminal and the second input terminal respectively. The level adjusting module receives a first input signal and a second input signal of a pair of differential input signals respectively. The first input signal and the second input signal both have a first level but have inversed phases. The voltage module is coupled to the control node and used to provide a voltage signal having a second level to the control node.

Description

technical field [0001] The invention relates to a signal amplifying circuit, in particular to a signal amplifying circuit which has a simple circuit structure and can save DC power supply. Background technique [0002] Generally speaking, whether it is a traditional mobile phone, a smart phone or other electronic devices, a sound signal processing circuit is usually provided to properly process the sound signal. [0003] Please refer to figure 1 , figure 1 It is a functional block diagram of a conventional sound signal processing circuit. Such as figure 1 As shown, the traditional sound signal processing circuit 100 may include a digital-to-analog converter (DAC) 110, an analog mixer / router (Mixer / Router) 120, a headset (Headphone) output amplifier 130, an earphone (Earpiece) output amplifier 132 and Line Out amplifier 134 . [0004] When the DAC 110 receives the digital audio data signal S1 , the DAC 110 converts the digital audio data signal S1 into an analog audio da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
CPCH03F1/0266H03F3/187H03F3/45475H03F2200/03H03F2203/45008H03F2203/45101H03F2203/45138H03F2203/45596H03F2200/471H03F2203/45112
Inventor 林文胜
Owner UPI SEMICON CORP