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Low-voltage fully-differential operation amplifier circuit

An operational amplifier, fully differential technology, used in differential amplifiers, DC-coupled DC amplifiers, etc., can solve the problem of low differential gain, achieve low power consumption, high gain, and solve the effect of current mismatch

Inactive Publication Date: 2014-10-22
西安电子科技大学昆山创新研究院 +1
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a low-voltage fully differential operational amplifier circuit to solve the problem that the differential gain is not high due to the influence of the common-mode feedback circuit when the existing fully differential operational amplifier is used in low power supply

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Embodiment Construction

[0055] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0056] The invention provides a low-voltage fully differential operational amplifier circuit aiming at the problem that the differential gain is not high due to the influence of the common mode feedback circuit when the existing fully differential operational amplifier is applied in low power supply.

[0057] Such as figure 2 As shown, the low-voltage fully differential operational amplifier circuit of the embodiment of the present invention includes: a bias circuit 11, a two-stage fully differential operational amplifier 12 connected to the bias circuit 11, and a two-stage fully differential operational amplifier connected to the two-stage fully differential operational amplifier 12 connected common mode feedback circuit 13; wherein,

[0058] The bias...

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Abstract

The invention provides a low-voltage fully-differential operation amplifier circuit which comprises a biasing circuit (11), a two-level fully-differential operation amplifier (12) and a common-mode feedback circuit (13). The two-level fully-differential operation amplifier (12) is connected with the biasing circuit (11), and the common-mode feedback circuit (13) is connected with the two-level fully-differential operation amplifier (12); the biasing circuit (11) supplies biasing voltage to the two-level fully-differential operation amplifier (12); the common-mode feedback circuit (13) is used for stabilizing common-mode output voltage. By the above technical scheme, the problem that differential gain is not high due to affection of the common-mode feedback circuit when an existing fully-differential operation amplifier is applied in low power supply is solved, the common-mode output voltage is stabilized through current sources outputted and fed back to the two-level fully-differential operation amplifier through the common-mode feedback circuit, the problem about current mismatch caused by circuit asymmetry is solved, and low power supply voltage, high gain and low power consumption are realized under the condition that the stability of the system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of operational amplifier design in the technical field of microelectronics, and particularly designs a low-voltage fully differential operational amplifier circuit. Background technique [0002] Operational amplifiers (op amps for short) are an integral part of many analog and mixed-signal systems. A large number of operational amplifiers of varying complexity are used to perform various functions: from DC bias generation to high-speed amplification or filtering. With each generation of complementary metal-oxide-semiconductor (CMOS) technology, the design of op amps has become more complex due to reductions in supply voltages and transistor channel lengths. As the power supply voltage decreases, the dynamic range will decrease, and the signal swing can be increased by using differential operation. The lower limit of the dynamic range will also be of concern, in order for the dynamic range to decrease propo...

Claims

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Application Information

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IPC IPC(8): H03F3/45
Inventor 刘帘曦罗勇朱樟明王玉涛杨银堂
Owner 西安电子科技大学昆山创新研究院
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