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Distortion Cancellation Bias Circuit for Improving Amplifier Linearity and Method for Improving Linearity

A bias circuit and linearity technology, applied in the field of microelectronics, can solve the problem that the amplifier is difficult to meet the system requirements, and achieve the effect of simple and clear working principle and improved linearity

Active Publication Date: 2018-06-15
南京美辰微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modern wireless communication systems (such as wireless base stations) put forward higher and higher requirements for the linearity of the communication system, and the existing technologies for improving the linearity of the amplifier have been difficult to meet the system requirements

Method used

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  • Distortion Cancellation Bias Circuit for Improving Amplifier Linearity and Method for Improving Linearity
  • Distortion Cancellation Bias Circuit for Improving Amplifier Linearity and Method for Improving Linearity
  • Distortion Cancellation Bias Circuit for Improving Amplifier Linearity and Method for Improving Linearity

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Embodiment 1

[0022] Embodiment 1: see figure 2 (a), as an improvement of the present invention, the distortion current i 1 Flow into the emitter of the NPN transistor T2, and then enter the scaling circuit 102 from the collector of the NPN transistor T2, 102 is set as an m:1 current mirror, and the circuit 102 converts the scaled distorted current mi 1 into the distorted current removal circuit 103; the distorted current removal circuit 103 receives the distorted current mi 1 After scaling k times again, the size will be kmi 1 The distorted current is sent to the emitter of the triode 200 to complete the offsetting work of the distorted current; the small signal analysis and derivation shows that the small signal current of the collector of the triode 200 is i C3 =(1+α)i 1 -kmi 1 =(1+α-km)i 1 , when km=1+α, i C3 =0, this formula shows that there is no any distorted current in the collector of the triode 200. The linearity of the triode 200 is greatly improved.

Embodiment 2

[0023] Example 2: see figure 2 (b), as an improvement of the present invention, the distortion current i 1 It flows into the emitter T2 of the PNP transistor, and then directly enters the distortion removal circuit 103 from the collector of the PNP transistor T2. Since the distortion removal circuit 103 itself also has current scaling capability, the scaling circuit 102 in this case can be removed . The distorted current removal circuit 103 takes the received distorted current i 1 After scaling by k times, it is sent to the emitter of the triode 200 to complete the offsetting work of the distortion current; the small signal current of the collector of the triode 200 is deduced through small signal analysis as i C3 =(1+α)i 1 -ki 1 =(1+α-k)i 1 , when k=1+α, i C3 =0, this formula shows that there is no any distorted current in the collector of the triode 200. The linearity of the triode 200 is greatly improved.

Embodiment 3

[0024] Embodiment 3: see image 3 , as an improvement of the present invention, in this embodiment, the distortion current extraction circuit 102 and the triode 200 to be canceled are both part of the distortion cancellation circuit 103 . Its specific distortion cancellation process is as follows: distortion current i 1 Inflow from the emitter of NPN transistor T2, flow out from the collector of T2 into the m:1 current mirror; the m:1 current mirror will distort the current i 1 After being scaled by m times, it is sent to the collector of transistor T1; transistors T1, T2, T3 and resistors R1, R2 form a current mirror with a ratio of k, and the current mirror scales the collector circuit of T1 by k times and mirrors it to the collector of transistor T3 ; Obtain the small signal current i of the collector of the triode 200 (T3) C3 =(1+α)i 1 -mki 1 =(1+α-mk)i 1 , when km=1+α, i C3 =0, this formula shows that there is no any distorted current in the collector of the triode ...

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Abstract

The invention relates to a distortion canceling bias circuit for improving the linearity of an amplifier. The distortion canceling bias circuit includes a distortion current extraction circuit, a distortion current scaling circuit and a distortion current removal circuit. It is characterized in that the distorted current extraction circuit extracts the distorted current generated by the reverse-biased diode between the collector and the base from the base of the triode, and then sends the extracted distorted current to the distorted current scaling circuit for preliminary scaling processing, and the distorted current removal circuit will The scaled distortion current is sent back to the triode to be canceled to complete the work of distortion cancellation. The structural design of this technical scheme is ingenious, and the entire distortion cancellation circuit is completed in the bias circuit of the triode, which does not affect the signal processing of the triode itself. It can be widely used in the design of various amplifiers, and can be combined with other technologies to improve the linearity of the amplifier. Used at the same time, the performance of the amplifier is greatly improved.

Description

technical field [0001] The invention relates to a bias circuit, in particular to a distortion offset bias circuit for improving the linearity of an amplifier and a method for improving the linearity, belonging to the field of microelectronic technology. Background technique [0002] High-performance amplifiers are widely used in various communication systems as sub-circuit units. In the transceiver, the amplifier used to drive the analog-to-digital converter (AD) in the receiving chain and the power amplifier (PA) in the transmitting chain is also called a driving amplifier. The output signal amplitude of this type of amplifier is relatively large, and the signal is easily distorted. In order not to affect the system performance, there are high requirements on the linearity index of the driving amplifier. The techniques used to provide the linearity of power amplifiers mainly include feedback, feedforward, predistortion techniques, and adaptive biasing techniques. Most of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32
Inventor 姜亚伟邹闽中邓青吴烜
Owner 南京美辰微电子有限公司
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