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A balanced amplifier

An amplifier and balance technology, applied in low-frequency amplifiers, power amplifiers, push-pull amplifiers, etc., can solve the problems of unstable amplifiers and inability to obtain expected effects.

Inactive Publication Date: 2007-07-11
林志明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these are all advantages that feedback provides, applying too much feedback can lead to instability in the amplifier, while applying too little feedback does not give the desired effect
Therefore, it is often difficult for the designer to push the overall amplifier performance to the optimum level by using a single-pair feedback loop

Method used

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Embodiment Construction

[0024] FIG. 1 shows a schematic block diagram of a vacuum tube balanced amplifier of the first embodiment of the present invention, and FIG. 2 shows a detailed circuit diagram.

[0025] As shown in Figure 1, the first stage is a special type of difference amplifier consisting of amplifying devices 7 and 8, resistors 1, 2, 3 and 4, and a current source 11. The first stage receives a balanced input signal (+INPUT & -INPUT) and provides two pairs of feedback interfaces to feed back the output signal of the subsequent amplifier stage to the first stage.

[0026] The second stage is yet another type of special differential amplifier consisting of amplifying devices 9 and 10 , resistors 5 and 6 and a current source 12 . The second stage amplifies the balanced signal from the first stage and maintains the balanced signal for subsequent amplification or output power stages.

[0027] Further details are shown in Figure 2A. The balanced amplifier consists of four pairs of dual vacuum ...

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PUM

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Abstract

A balanced amplifier is disclosed as comprising an two stage connecting amplifier, where an input stage receives balanced input signals and outputs signals to the second stage, and the input stage is provided with two pairs of feedback loops, at least one of the pair of feedback loops for feedbacking part of signals outputted by the second stage to the first differential amplifier, and the second stage includes a second differential amplifier for amplifying signals and for maintaining the balanced signals.

Description

technical field [0001] The invention relates to a balanced amplifier, in particular to a balanced amplifier with multiple feedback loops. Background technique [0002] Semiconductor-based audio power amplifiers have dominated the audio market since the 1960s. Advantages of using semiconductor components in audio signal amplification include small size, high efficiency, and high output power. However, the sound quality of semiconductor audio amplifiers is different from vacuum tube audio amplifiers, and many audio enthusiasts prefer the sound of vacuum tube amplifiers, so they choose vacuum tube audio amplifiers. Since the 1980s, the vacuum tube audio system has gradually returned to the market again, and has enjoyed a good market share in the high-end audio market. [0003] In high-end audio applications, balancing techniques are often used in semiconductor amplifiers, such as high-power amplifiers and preamplifiers. The advantage of using balanced techniques is the elimi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/28H03F1/33H03F1/50H03F1/56H03F3/181H03F3/22H03F3/36H03F3/45
CPCH03F3/22H03F3/45H03F1/36H03F3/28
Inventor 林志明
Owner 林志明