On-chip integrated broadband linearizer based on variable capacitor

A technology of variable capacitance and linearizer, applied in improving amplifiers to reduce nonlinear distortion, power amplifiers, improving amplifiers to expand bandwidth, etc., can solve problems such as narrow application bandwidth and poor adjustability of analog predistorters, and achieve Broaden the bandwidth, improve the standing wave of the port, and facilitate the adjustment

Active Publication Date: 2020-06-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] In view of the above-mentioned deficiencies, in order to solve the problem of poor adjustability and narrow application bandwidth of the analog predistorter in the prior art, the present invention provides an on-chip integrated broadband linearizer based on a variable capacitor, which improves the existing on-chip integrated broadband linearizer. The linearization performance of the linearizer improves the bandwidth, reduces the insertion loss, and is easy to adjust

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  • On-chip integrated broadband linearizer based on variable capacitor
  • On-chip integrated broadband linearizer based on variable capacitor
  • On-chip integrated broadband linearizer based on variable capacitor

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Embodiment

[0042] In order to verify the effect of the present invention, based on Wenmao PE15 technology, utilize software ADS simulation software to design two power amplifiers of Ka frequency band (24GHz-28GHz), one of them is the AB class power amplifier without integrated linearizer, and the other is in the A class AB power amplifier of the present invention is added on the basis of a power amplifier. Carry out two-tone signal (interval 100MHz) simulation on two power amplifiers, the working frequency is 24-28GHz, the result is as follows Figure 4(a)-Figure 4(e) The resulting figure is shown. From the figure, we can find that the third-order intermodulation (IMD3) of the traditional class AB power amplifier is compared with the third-order intermodulation (IMD3) of the class AB power amplifier with integrated linearizer. The third-order intermodulation (IMD3) of the linearizer is greatly improved, and the maximum improvement can reach 25dB. The operating bandwidth of the prior ar...

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Abstract

The invention discloses an on-chip integrated broadband linearizer based on a variable capacitor, and belongs to the technical field of microwave and millimeter wave monolithic circuits. A linearizedcircuit control module is used for controlling a direct-current voltage drive provided for a reflective pre-distortion signal generator and a cold-mode pHEMT transistor compensation correction circuit, so as to adjust the size of the generated linearized signal. Then, a reflective pre-distortion signal generator and a cold mode pHEMT transistor compensation correction circuit are combined; the pre-distortion signals are generated and compensated, pre-distortion linearized signals are finally generated to counteract nonlinearity of the power amplifier, and the reflective pre-distortion signal generator and the cold mode pHEMT transistor compensation correction circuit are matched with a low-loss matching module to further reduce insertion loss. According to the broadband linearizer, the problem that a traditional linearizer cannot be applied to a broadband is solved, and the bandwidth is better broadened. The filter has the characteristics of low insertion loss, wide application bandwidth, compact structure and remarkable linearization improvement.

Description

technical field [0001] The invention belongs to the technical field of microwave and millimeter-wave monolithic circuits, is applied to the technical field of linearization of millimeter-wave power amplifier monolithic circuits, and specifically relates to an on-chip integrated broadband linearizer based on a variable capacitor. Background technique [0002] RF analog devices play an important role in wireless communication systems, and analog signal power amplifiers are the core of them. At present, when the power amplifiers widely used in engineering require linearized output, they often adopt the method of power back-off, that is, work at a power lower than the saturated output power, but this method will greatly reduce the power-added efficiency of the amplifier, resulting in many Large energy loss and waste. In order to improve the power efficiency of the power amplifier and reduce the cost, the usual practice is to make the power amplifier work in a state of low linea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/42H03F1/32H03F3/20
CPCH03F1/42H03F1/32H03F3/20Y02D30/70
Inventor 王磊曾雁声肖鑫平李朗杨杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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