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class ab amplifier

An amplifier and gain amplifier technology, which is applied to power amplifiers, improving amplifiers to improve efficiency, etc., can solve the problems of low voltage swing and current driving capability of power amplifier stage 12 and large power consumption of voltage amplifier stage 11, etc.

Active Publication Date: 2012-02-08
REALTEK SEMICON CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] However, when the supply voltage V DD When it is large, the voltage swing (Voltage Swing) and current driving capability of the power amplifier stage 12 are larger, but the power consumption of the voltage amplifier stage 11 is also larger, and when the power supply voltage V DD small, the power consumption of the voltage amplifier stage 11 is small, but the voltage swing and current drive capability of the power amplifier stage 12 are also small, so the known class AB amplifier cannot meet the general expectations, that is, the voltage swing and current drive capability are large While the power consumption is small

Method used

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Embodiment Construction

[0016] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings.

[0017] refer to figure 2 , A preferred embodiment of the class AB amplifier of the present invention includes a voltage amplification stage 2, a level shift (Level Shift) stage 3 and a power amplification stage 4. Voltage amplification stage 2 operates at a first supply voltage V DD1 and amplifies a differential input voltage to generate an amplified voltage. The level shifting stage 3 adjusts the DC level of the amplified voltage to generate a shifted voltage. The power amplifier stage 4 operates at a second power supply voltage V DD2 down operation, and convert the shift voltage to generate an output current. where the second supply voltage V DD2 greater than the first supply voltage V DD1 .

[0018] The voltage amplifying stage 2 may adopt a str...

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Abstract

A Class AB amplifier includes a voltage amplifying stage, a level shifting stage and a power amplifying stage. The voltage amplifying stage operates under a first power supply voltage and amplifies a differential input voltage to generate an amplified voltage. The level shift stage adjusts the DC level of the amplified voltage to generate a shifted voltage. The power amplifying stage operates under a second power supply voltage, and converts the shift voltage to generate an output current. Wherein, the second power supply voltage is greater than the first power supply voltage. The present invention can improve voltage swing and current driving capability and reduce power consumption.

Description

technical field [0001] The present invention relates to an amplifier, in particular to a Class AB amplifier. Background technique [0002] see figure 1 , a known class AB amplifier includes a voltage amplification stage 11 and a power amplification stage 12, and amplifies and converts a differential input voltage into an output current. The voltage amplification stage 11 usually adopts a floating gate structure, and includes a first to a third P-type metal oxide semiconductor (PMOS) 111-113 and a first to a third N-type metal oxide semiconductor (PMOS) semiconductors (NMOS) 114-116, wherein the AC variation of the voltage at point A is related to the differential input voltage. The power amplifier stage 12 includes a fourth PMOS 121 and a fourth NMOS 122 . [0003] Since the voltage amplifying stage 11 will operate normally when the following formula is satisfied, the voltage amplifying stage 11 and the power amplifying stage 12 must operate at the same power supply volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20H03F3/21H03F1/02
Inventor 张文华
Owner REALTEK SEMICON CORP
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