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A self-adjusting amplifier, its control method, and a multi-stage operational amplifier

An amplifier and self-zeroing technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as output voltage burrs, ripples, and amplifier output voltage jumps, and reduce output burrs and ripples Effect

Active Publication Date: 2021-06-18
坤元微电子(南京)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing auto-zero amplifier, in the auto-zero state, the output of the amplifier will generate a voltage difference related to the offset voltage of the amplifier input. When the amplifier switches from the auto-zero state to the amplified state, the voltage difference becomes zero, the output voltage of the amplifier experiences a jump, which in turn causes glitches and ripples in the output voltage of the entire system

Method used

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  • A self-adjusting amplifier, its control method, and a multi-stage operational amplifier
  • A self-adjusting amplifier, its control method, and a multi-stage operational amplifier
  • A self-adjusting amplifier, its control method, and a multi-stage operational amplifier

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Embodiment 1

[0030] figure 1 It is a structural schematic diagram of a self-adjusting amplifier provided in Embodiment 1 of the present invention, figure 2 It is a schematic diagram of timing control of the self-adjusting amplifier provided in Embodiment 1 of the present invention. refer to figure 1 , a self-adjusting amplifier, characterized in that it includes: an amplification module AN, and the amplification module AN includes a first input terminal VIP, a second input terminal VIN, a third input terminal VOS_P, a fourth input terminal VOS_N, a first output terminal VOP and The second output terminal VON;

[0031] A first switch S1 connected in parallel between the first input terminal VIP and the second input terminal VIN; a second switch S2 connected in parallel with the second input terminal VIN; connected between the third input terminal VOS_P and the first output terminal VOP The third switch S3; the fourth switch S4 connected between the fourth input terminal VOS_N and the se...

Embodiment 2

[0038] image 3 It is a structural schematic diagram of an auto-zero amplifier provided in Embodiment 2 of the present invention. On the basis of the first embodiment above, optionally, refer to image 3 , the discharge control circuit 10 includes a discharge switch S0 connected between the first output terminal VOP and the second output terminal VON.

[0039] Specifically, after the amplifying module AN exits the self-adjusting state and before entering the amplifying state, control the first switch S1, the second switch S2, the third switch S3, the fourth switch S4, the fifth switch S5 and the sixth switch S6 to close turn off, control the discharge switch S0 to be turned on, and the discharge switch S0 is turned on so that the first output terminal VOP and the second output terminal VON of the amplification module AN are short-circuited, so that the first output terminal VOP and the second output terminal VON of the amplification module AN The voltage difference between t...

Embodiment 3

[0054] Figure 5 It is a structural schematic diagram of a multi-stage operational amplifier with self-adjusting function provided in Embodiment 3 of the present invention. On the basis of the above embodiments, optionally, refer to Figure 5 , including the main amplifier , adder 30, and two auto-zeroing amplifiers, such as Figure 5 in the first auto-zero amplifier 101 and the second auto-zero amplifier 102; where the first input of each auto-zero amplifier is connected to the main amplifier The first input terminal of each auto-zero amplifier is electrically connected to the second input terminal of the main amplifier The second input end of each auto-zeroing amplifier is electrically connected to the first input end of the adder 30, and the second output end of each auto-zeroing amplifier is electrically connected to the second input end of the adder 30. terminal connection, main amplifier The first output terminal of is electrically connected with the third input ...

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Abstract

The embodiment of the invention discloses a self-zeroing amplifier, its control method, and a multi-stage operational amplifier. The self-zeroing amplifier includes an amplification module, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a first switch, a second switch, a third switch, a fourth switch, and a sixth switch. The fifth switch and the sixth switch are turned on or off to control the amplifying module to switch between the self-zeroing state and the amplifying state; and the discharge control circuit is used for after the amplifying module exits the self-adjusting state and before entering the amplifying state Control the discharge of the amplifying module, so that the voltage difference at the output of the amplifying module is discharged to zero before entering the amplifying state, avoiding voltage jumps at the output of the amplifying module when entering the amplifying state, and reducing output burrs and ripples of the amplifier. The invention can solve the problems of output burrs and ripples of the amplifier caused by the voltage difference at the output terminal of the amplifying module jumping during the switching of the self-zeroing and amplifying states of the existing self-zeroing amplifier.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of amplifier control, in particular to an auto-zero amplifier, a control method thereof, and a multi-stage operational amplifier. Background technique [0002] Auto-zero amplifiers achieve microvolt-level input offset voltage and extremely low input offset voltage drift over time / temperature through an auto-zero mechanism. The 1 / f noise of the auto-zero amplifier is also seen as a dc error, which can also be eliminated by the auto-zero mechanism. Therefore, self-zeroing amplifiers are often used in amplification and regulation circuits. [0003] However, in the existing auto-zero amplifier, in the auto-zero state, the output of the amplifier will generate a voltage difference related to the offset voltage of the amplifier input. When the amplifier switches from the auto-zero state to the amplified state, the voltage As the difference becomes zero, the output voltage of the amplifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02H03F1/30H03F3/45
CPCH03F1/02H03F1/30H03F3/45179
Inventor 张浩然
Owner 坤元微电子(南京)有限公司
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