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Novel power amplification circuit

A power amplifier circuit, a new technology, applied in the direction of power amplifiers, amplifiers, differential amplifiers, etc., can solve the problems of poor stability and high power consumption, and achieve the effect of ensuring stability

Active Publication Date: 2019-01-01
曹政新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure low harmonic distortion, traditional power amplifiers use single-stage Class A and B amplifiers. Due to the influence of the integrated circuit bandwidth gain product, this type of structure is suitable for high signal bandwidth, low harmonic distortion and low power consumption systems. face many challenges
An effective way to reduce harmonic distortion is to increase the loop gain of the operational amplifier, but increasing the gain of high-frequency signals means higher power consumption and the risk of poor stability

Method used

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Embodiment Construction

[0048] The invention provides a new type of power amplifier circuit, which includes cascaded primary operational amplifier units and at least one secondary operational amplifier unit, the output of the primary operational amplifier unit forms local feedback to the primary operational amplifier unit, and the output of the secondary operational amplifier unit An interstage feedback is formed to the primary operational amplifier unit.

[0049] A compensation circuit is also included; the compensation circuit includes resistance and / or capacitance and / or inductance, or a combination thereof. Its value can take any value, even 0. To meet the needs of different application scenarios.

[0050] exist figure 1 In the shown single-ended embodiment of the present invention, a single-ended amplifier circuit is formed by cascading the first operational amplifier OP1 and the second operational amplifier OP2.

[0051] The output terminal of the first operational amplifier OP1 is connected...

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Abstract

The invention provides a novel power amplification circuit. The circuit comprises a primary operational amplifier unit and at least one secondary operational amplifier unit which are cascaded. The output of the primary operational amplifier unit forms local feedback to the primary operational amplifier unit. The output of the secondary operational amplifier unit forms interstage feedback to the primary operational amplifier unit. By using the power amplification circuit, a single-ended or fully-differential structure can be realized, the circuit is suitable for different application situations, a high signal bandwidth is maintained and simultaneously the open-loop gain of a power amplifier is greatly increased so that a total harmonic distortion is reduced, and stability is ensured.

Description

technical field [0001] The invention belongs to the field of power amplifiers, in particular to a power amplifying circuit using cascaded operational amplifiers. Background technique [0002] In the existing technology, power amplifiers are widely used in communication systems, audio systems and many other fields. Wide signal bandwidth, low harmonic distortion, low power consumption, and maintaining circuit stability have always been the pursuit goals of high-performance power amplifiers. In order to ensure low harmonic distortion, traditional power amplifiers use single-stage Class A and B amplifiers. Due to the influence of the integrated circuit bandwidth gain product, this type of structure is suitable for high signal bandwidth, low harmonic distortion and low power consumption systems. Faced with many challenges. An effective way to reduce harmonic distortion is to increase the loop gain of the operational amplifier, but increasing the gain of high-frequency signals m...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F1/34H03F3/21H03F3/45H03G3/30
CPCH03F1/3211H03F1/34H03F3/21H03F3/45479H03G3/30Y02D30/70
Inventor 曹政新
Owner 曹政新