Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier

A fully differential amplifier, single-ended current technology, used in single-ended push-pull amplifiers, amplifiers, differential amplifiers, etc., can solve the problems of complex bias circuits, increased circuit area, and difficulty in frequency compensation.

Inactive Publication Date: 2008-10-01
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although folded cascode amplifiers can provide high gain, they are not suitable for applications with low operating voltage due to high voltage headroom
In addition, the folded cascode amplifier has a complex bias circuit, which increases the circuit area
[0008] Because the high-gain amplifier is implemented as a multi-stage device, an increase in circuit area is inevitable, which makes frequency compensation difficult
Therefore, due to the necessity of frequency compensation using techniques such as Nested Miller Compensation (NMC) or Multipath NMC (MNMC), problems such as design difficulty and power consumption increase according to the hierarchy arise

Method used

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  • Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier
  • Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier
  • Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier

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Embodiment Construction

[0031] Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the same reference numerals refer to the same parts throughout.

[0032] figure 1 is a block diagram of a fully differential class AB amplifier according to an exemplary embodiment of the present invention. refer to figure 1 , the fully differential class AB amplifier 100 includes a fully differential class AB amplification block 110 and a common mode feedback (CMFB) block 120 .

[0033] The fully differential class AB amplification block 110 ...

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Abstract

A fully differential amplifier includes a first single-ended current mirror type fully differential amplifier outputting a first output signal by two stage amplifying a difference between a first input signal and a second input signal and a second single-ended current mirror type fully differential amplifier outputting a second output signal by two stage amplifying a difference between the first input signal and the second input signal. A first tail of the first single-ended current mirror type fully differential amplifier and a second tail of the second single-ended current mirror type fully differential amplifier are connected to each other and the first output signal and the second output signal are differential signals.

Description

[0001] This application claims priority from Korean Patent Application No. 2007-0029106 filed with the Korean Intellectual Property Office on March 26, 2007, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0002] The present disclosure relates to a differential amplifier, and more particularly, to a two-stage fully differential operational transconductance amplifier (OTA). Background technique [0003] As the application of CMOS technology continues to gradually shrink and the demand for battery-operated portable electronics increases, many constraints arise in designing very large scale integration (VLSI) devices. Typical constraints are the requirement for low voltage operation and low power consumption. [0004] As the trend of using system-on-chip (SOC) devices accelerates, not only digital circuits but also analog circuits are integrated on a single chip. As a result, analog circuits, which are normally less affected by co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F3/30
CPCH03F2203/45318H03F3/3022H03F3/45183H03F3/45475H03F2203/45134H03F2203/45364H03F3/30H03F3/45
Inventor 金亨来
Owner SAMSUNG ELECTRONICS CO LTD
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