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Feedforward amplitude linearization method for deep class AB power amplifier and circuit

A power amplifier and linearization technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, low-frequency amplifiers, etc., can solve the problems of DPD processing effect reduction, DAC dynamic range utilization rate reduction, and stability difficult to be guaranteed.

Active Publication Date: 2019-02-01
博流智能科技(南京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the more severe DPD processing will reduce the utilization rate of the DAC dynamic range, and the other is that when the signal bandwidth is wide and the memory effect of the PA has a significant impact, the effect of DPD processing will be greatly reduced
The problem with this method is that the stability of the loop is difficult to guarantee, and the bandwidth that can be achieved is limited
The wider the signal bandwidth, the wider the loop bandwidth requirement, the more difficult the design, and the more difficult it is to guarantee the stability

Method used

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  • Feedforward amplitude linearization method for deep class AB power amplifier and circuit
  • Feedforward amplitude linearization method for deep class AB power amplifier and circuit
  • Feedforward amplitude linearization method for deep class AB power amplifier and circuit

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Embodiment 1

[0092] see Figure 5 , Figure 5 The feed-forward linearization technology is revealed; the feed-forward bias voltage adjustment technology can improve the gain reduction of class A or shallow class AB amplifiers due to output soft limiting or transistors partially entering the sub-threshold region. Such as Figure 5 As shown, an envelope detector is used to detect the amplitude of the input signal, and at the same time output a bias voltage positively related to the input amplitude. When the PA input signal amplitude increases, the bias voltage increases, which can alleviate the shallow AB bias. The degree to which the PA power tube enters the sub-threshold region, thereby improving the linearity of the amplitude gain.

[0093] see Figure 6 , The present invention discloses a feed-forward amplitude linearization circuit of a deep class AB power amplifier. The feed-forward amplitude linearization circuit includes: an envelope detection circuit and a bias voltage generation...

Embodiment 2

[0126] The invention discloses a feed-forward amplitude linearization method of a deep class AB power amplifier. The method includes the following steps: converting the input signal envelope detector output signal into a CMOS radio frequency power amplifier PA bias voltage, and making the bias voltage As the input signal amplitude increases, it decreases, so that the gain reduction caused by the reduction of the bias voltage of the CMOS RF power amplifier PA is used to offset the gain increase caused by the CMOS RF power amplifier PA transistor entering the saturation region from the sub-threshold region to achieve linearization. Amplitude gain.

[0127] The present invention also discloses a feedforward amplitude linearization circuit of a deep class AB power amplifier. The feedforward amplitude linearization circuit includes: a bias voltage conversion circuit and a bias voltage control circuit.

[0128] A bias voltage conversion circuit, used to convert the input signal enve...

Embodiment 3

[0131] The invention discloses a feedforward amplitude linearization circuit of a deep class AB power amplifier, and the feedforward amplitude linearization circuit includes a bias voltage generation circuit. The bias voltage generation circuit is used to subtract the current containing the envelope information output by the envelope detection circuit from a fixed current to generate a bias current negatively related to the input signal amplitude, and then convert it into a bias voltage; thus it can be used The decrease in the gain of the CMOS radio frequency power amplifier PA brought about by the reduction of the bias voltage offsets the gain increase caused by the transition of the CMOS radio frequency power amplifier PA transistor from the sub-threshold region to the saturation region.

[0132] The bias voltage generation circuit includes: a bias current control circuit and a bias voltage conversion circuit.

[0133] The bias current control circuit is used to change the c...

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PUM

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Abstract

The invention discloses a feedforward amplitude linearization method for a deep class AB power amplifier and a circuit. The method comprises the following steps of converting an output signal of an envelope detector of an input signal into a bias voltage of a CMOS PA, allowing the bias voltage to descend along ascend of amplitude of the input signal, so as to offset gain increase caused by switching of the CMOS PA from a sub-threshold region to a saturation region by using gain decrease due to reduction of bias voltage of the CMOS PA to realize linearized amplitude gain. The feedforward amplitude linearization method for the PA bias voltage auto adjustment circuit and the deep class AB power amplifier linearizes amplitude gain deep class AB biased PA, thereby lowering power consumption andkeeping linearizing PA.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a CMOS radio frequency power amplifier, in particular to a feedforward amplitude linearization method of a deep class AB power amplifier. Background technique [0002] CMOS RF power amplifiers (PAs) have the advantage of being integrated on-chip, but due to the limitations of device performance, it is also a huge challenge to design high-efficiency and high-performance PAs. OFDM technology is widely used in WLAN, LTE and other protocols due to its high channel utilization and anti-interference advantages. However, due to the inherent disadvantages of high peak-to-average power ratio (PAPR) of OFDM itself, the transmitter requires PA to have excellent performance. Linearity, at the same time, the average transmit power needs to be fully retreated from the peak transmit power, which will greatly reduce the transmit efficiency of the PA. [0003] One way to improve back-of...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/187H03F3/213H03G3/30
CPCH03F1/3223H03F1/3247H03F3/187H03F3/213H03G3/3042H03F2200/451
Inventor 张俊峰韩洪征施子韬宋永华
Owner 博流智能科技(南京)有限公司
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