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Balanced output circuit and electronic device using the same

一种平衡输出、电路的技术，应用在带有半导体器件/放电管的放大器、电气元件、直流耦合的直流放大器等方向，能够解决成本增加、电路构成复杂等问题，达到可靠偏置消除、降低成本的效果

Inactive Publication Date: 2007-02-21
ROHM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the DC bias voltage can be controlled, the circuit configuration becomes complicated, and the cost of the IC incorporated in the BTL amplifier increases.

Method used

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  • Balanced output circuit and electronic device using the same
  • Balanced output circuit and electronic device using the same
  • Balanced output circuit and electronic device using the same

Examples

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Embodiment Construction

[0023] Embodiments of the balanced output circuit of the present invention and electronic devices such as mobile phones using the balanced output circuit will be described below with reference to the drawings. In addition, since the balanced output circuit and front-end circuit of this invention are built into LSI, it can also be called a semiconductor device.

[0024] figure 1 It is a diagram showing the structure of a balanced output circuit according to the first embodiment of the present invention and an electronic device such as a mobile phone using the balanced output circuit. These are applicable to electrical / electronic devices that output in-phase output signals and inverse-phase output signals in a balanced manner, such as baseband signal transmission output units for mobile phones and BTL speaker drivers.

[0025] figure 1 Among them, the front-end circuit 30 processes an AC signal such as an audio signal, and at the same time synthesizes an AC signal such as an a...

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PUM

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Abstract

An input signal is outputted as a first output signal, while an inverting / amplifying circuit, which receives the input signal and a comparison voltage, is used to invert and amplify a voltage in accordance with the input signal to output it as a second output signal. Then, the first and second output signals are compared, and a capacitor is charged to control the comparison voltage in such a manner that the DC voltage of the second output signal is equal to the DC voltage of the first output signal. In this way, a simple circuit is used to surely cancel a DC offset voltage between the first output signal (non-inverted output signal) and the second output signal (inverted output signal).

Description

technical field [0001] The present invention relates to a balanced output circuit for outputting in-phase output and reverse-phase output in a balanced manner, and electronic equipment such as a mobile phone using the balanced output circuit. Background technique [0002] In baseband signal transmission and output units of mobile phones or BTL (Balanced Transformer Less, bridge-type push-pull amplifier circuit) speaker driver (speaker driver), etc., use the non-inverting output of the same phase as the input signal and the inverting phase of the opposite phase. A balanced output circuit that outputs a balanced output. [0003] In a conventional audio power amplifier circuit, an audio signal and an inverted feedback signal from a prestage circuit (prestage circuit) via a coupling capacitor are input to a BTL type amplifier. In this BTL type amplifier, an amplified signal to which a reference voltage is applied to a difference between an audio signal and an inverted feedback ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/68H03F3/34
CPCH03F2203/45212H03F2203/45146H03F2203/45138H03F3/45932H03F2200/421H03F3/68H03F3/34
Inventor 千田泰辅
Owner ROHM CO LTD
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