A dynamically matched voltage amplifier for eliminating resistance process errors

A voltage amplifier and dynamic matching technology, applied in improving amplifiers to improve efficiency, improving amplifiers to reduce the harmful effects of internal resistance, and control of amplification, etc., can solve problems such as the inability to guarantee the stability of device matching, and save trimming. The time and process cost required, the circuit structure is simple, and the gain accuracy is guaranteed.

Pending Publication Date: 2019-05-03
深圳市万微半导体有限公司
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  • Application Information

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Problems solved by technology

[0003] However, in this structure, the low-frequency accuracy of the transfer function from Vin to Vout is determined by the process matching of devices R1 and R2, and this matching is random for each chip and each wafer
Even if a solution including trimming technology is used, the long-term device matching stability cannot be guaranteed

Method used

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  • A dynamically matched voltage amplifier for eliminating resistance process errors
  • A dynamically matched voltage amplifier for eliminating resistance process errors
  • A dynamically matched voltage amplifier for eliminating resistance process errors

Examples

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Embodiment Construction

[0024] The present invention is further described below in conjunction with accompanying drawing and embodiment:

[0025] Such as figure 2 As shown, two resistors R1 and R2 with equal resistance together with amplifier A form a dynamic feedback circuit, and Vout=(1+R2 / R1)Vin, ideally Vout=2Vin.

[0026] In actual production, R1≠R2 due to process mismatch and random matching errors caused by long-time work.

[0027] Suppose R1=(1+x)R0, R2=(1-x)R0, X is the matching error, then:

[0028] exist figure 1 case,

[0029] Vout=(1+R2 / R1)×Vin

[0030] =[1+(1-x) / (1+x)] × Vin

[0031] =2Vin / (1+x)

[0032] ≈2(1-x)Vin x<<1

[0033] Vout is a first order function of the random error x.

[0034] exist figure 2 the case

[0035] Controlled by a digital circuit, when the phase is 1, Vout1=(1+R2 / R1)×Vin;

[0036] When the phase is 2, Vout1=(1+R1 / R2)×Vin.

[0037] Average gain G=(Vout1+Vout2) / 2Vin

[0038] =[2Vin / (1+x)+ 2Vin / (1-x)] / 2Vin

[0039] =1 / (1+x)+ 1 / (1-x)

[0040] =2 / (1-...

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Abstract

The invention discloses a dynamic matching voltage amplifier for eliminating a resistor process error. The dynamic matching voltage amplifier comprises a first amplifier, a second amplifier and a resistor rotating chain, wherein the positive input end of the first amplifier and the positive input end of the second amplifier are connected with a signal input end; The resistor rotating chain comprises a plurality of resistors which are connected end to end to form a closed loop; every two adjacent resistors are connected with the switch group; Each switch group comprises six switches which are connected in parallel; and the inner sides of the six switches are communicated with the two adjacent resistors, and the outer sides of the six switches are respectively connected with the negative input end of the first amplifier, the negative input end of the second amplifier, the positive voltage output end, the negative voltage output end, the output end of the first amplifier and the output end of the second amplifier. The dynamic matching voltage amplifier has wide applicability, can avoid using a trimming technology required by a resistor matching error, saves time and process cost required by trimming, and can achieve long-time stability.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a dynamic matching voltage amplifier for eliminating resistance process errors. Background technique [0002] In the prior art, a generally used voltage feedback amplifier is composed of amplifier A, feedback resistors R1 and R2, such as figure 1 shown. Therefore, Vout=(1+R2 / R1)Vin. The ratio of Vout to Vin is precisely defined by (1+R2 / R1). The precise operational amplifier commonly used in the industry is also realized by the above figure, using a structure composed of an active open-loop amplifier and a negative feedback network of passive devices. [0003] However, in this structure, the low-frequency accuracy of the transfer function from Vin to Vout is determined by the process matching degree of devices R1 and R2, and this matching degree is random for each chip and each wafer. Even if a solution including trimming technology is used, the long-term de...

Claims

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Application Information

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IPC IPC(8): H03F1/02H03F1/08H03F1/34H03G3/30
Inventor 刘磊熊力嘉
Owner 深圳市万微半导体有限公司
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