Low power consumption high slew rate high gain bandwidth product fully differential operational amplifier

An operational amplifier and operational amplification technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to expand bandwidth, etc., can solve the problem of not being able to provide high gain and high slew rate, not conforming to delta-sigma modulator, big tail Current and other issues, to achieve low power consumption, reduce transconductance, and enhance the effect of slew rate

Active Publication Date: 2014-10-01
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

The single-stage operational amplifier has the simplest structure, but it must have a large tail current to achieve high gain and high slew rate. It cannot provide high gain and high slew rate under low power consumption, so few people use it.
Two-stage Miller-compensated operational amplifiers are commonly used, with relat

Method used

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  • Low power consumption high slew rate high gain bandwidth product fully differential operational amplifier
  • Low power consumption high slew rate high gain bandwidth product fully differential operational amplifier
  • Low power consumption high slew rate high gain bandwidth product fully differential operational amplifier

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Embodiment Construction

[0028] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as Figure 4 As shown, a fully differential operational amplifier with low power consumption, high slew rate and high gain-bandwidth product, including: a main operational amplifier unit, two slew rate enhancement circuits and a common-mode feedback unit.

[0030] Due to the large input and output swing and fast clock frequency, the gain-bandwidth product and slew rate required by the operational amplifier are very high, and the design is difficult. After comparing the structure of the op amp and researching the literature, the op amp finally adopts a first-stage current mirror structure and Class-AB output, and introduces current extraction technology, resistance compensation and slew rate enhancement technology to maximize the output while m...

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Abstract

The invention discloses a low power consumption high slew rate high gain bandwidth product fully differential operational amplifier. An operational amplifier circuit adopts an input stage current extraction structure and partially extracts currents inside a load pipe through an active current mirror to reduce the effective resistance of the operational amplifier; slew rate enhancing circuits are in parallel connection with bilateral sides of a main operational amplifier to enhance the slew rate of output signals; an output stage applies a Class-AB output structure. According to the low power consumption high slew rate high gain bandwidth product fully differential operational amplifier, the current mirror is connected to an input end load pipe in a parallel mode, the effect of transconductance reduction is achieved due to adjustment of the breadth length ratio of the current mirror, and accordingly the integral circuit keeps the gain bandwidth product and satisfies the integral modulator required level under the condition that the power consumption is reduced and a feedforward structure is connected to the operational amplifier in a parallel mode to inject compensating current for the load to increase the slew rate of the output signals when the operational amplifier is in a working state and transient state power consumption is not consumed excessively.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a fully differential operational amplifier with low power consumption, high slew rate and high gain-bandwidth product. Background technique [0002] Now all kinds of portable electronic devices are going to millions of households and various industrial applications. Data converters are increasingly in demand as the interface between analog and digital signals. The delta-sigma modulator can achieve unique high precision and has a wide range of applications. In the delta-sigma modulator, the design of the operational amplifier in the integrator is very important, especially the operational amplifier in the front stage, the noise generated by it contributes the most to the total output noise of the modulator. [0003] The op amp is used in a delta-sigma modulator and works as a first-stage integrator. The finite DC gain of the operational amplifier ...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F1/42H03M3/00
Inventor 赵梦恋苏汉阳吴晓波黄种艺
Owner ZHEJIANG UNIV
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