Doherty power amplifier based on adaptive bias
An adaptive bias and power amplifier technology, which is applied in power amplifiers, amplifiers, high-frequency amplifiers, etc., can solve the problems of power reduction of auxiliary power amplifiers, reduction of power added efficiency at the back-off power point, reduction of circuit gain, etc., to achieve increased gain and linearity, improve the efficiency of the fallback point, and improve the effect of linearity
Active Publication Date: 2022-05-27
优镓科技(苏州)有限公司
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Problems solved by technology
[0005]The traditional Doherty power amplifier auxiliary power amplifier is biased in the C class state, the grid width of the auxiliary power amplifier is larger than that of the main power amplifier, and the cut-off frequency of the auxiliary power amplifier is lower, making the auxiliary power amplifier The gain of the power amplifier is lower than that of the main power amplifier, and the auxiliary power amplifier is biased in a class C state, which further reduces the power of the auxiliary power amplifier
At the same time, the output quarter-wavelength line of the main power amplifier can be directly realized by the matching circuit, but for the auxiliary power amplifier, the input quarter-wavelength line is indispensable, and this structure will also bring loss, further reducing the auxiliary power amplifier. amplifier gain
The auxiliary power amplifier gain can be increased by adjusting the power split ratio, but this method will lead to a decrease in the overall circuit gain, and will also reduce the power-added efficiency (PAE) of the back-off power point
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[0031] One implementation is that for a transistor with a positive bias voltage, such as Figure 4 The adaptive biasing structure shown solves this problem. The first transistor and the transistors of the auxiliary power amplifier are both current-controlled transistors, wherein a voltage is applied to the collector of the first transistor, and the emitter is connected to the second resistor and then grounded. It also includes a voltage-controlled current source, which is connected between the emitter of the first transistor and the base of the transistor of the auxiliary power amplifier.
[0032] Figure 4 Among them, the first capacitor C1 is a DC blocking capacitor. Since the adaptive bias circuit needs to take a part of the signal from the input end of the main power amplifier, the DC blocking capacitor C1 is used to isolate the DC voltage of the adaptive bias circuit from the DC voltage of the main power amplifier. C2 is a filter rectifier capacitor. The first resistor...
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Abstract
The Doherty power amplifier comprises a power divider, a main power amplifier and an auxiliary power amplifier, the main power amplifier and the auxiliary power amplifier are connected in parallel and both connected with the output end of the power divider, the Doherty power amplifier further comprises a self-adaptive biasing circuit, one end of the self-adaptive biasing circuit is connected to the input end of the main power amplifier, and the other end of the self-adaptive biasing circuit is connected to the input end of the auxiliary power amplifier; the adaptive bias circuit includes a first transistor and a peripheral circuit. According to the Doherty power amplifier, the self-adaptive biasing circuit is adopted as the auxiliary power amplifier biasing circuit, and the problems of low gain, poor linearity and the like caused by the fact that an auxiliary power amplifier of a traditional Doherty power amplifier is biased in a C-type state are solved.
Description
technical field [0001] The invention relates to the technical field of microwave power amplifiers and integrated circuits, in particular to a Doherty power amplifier based on adaptive bias. Background technique [0002] The rapid growth of data rates has spawned the need for high-speed and complex modulation schemes with high spectral efficiency and large peak-to-average ratios. 5G communication base stations have more RF channels, wider bandwidths, higher frequencies, and larger peak-to-average ratios. The power amplifier and its related baseband circuits are the main energy-consuming components of the communication base station, and the power consumption accounts for more than 50%. Therefore, this puts forward higher requirements for the power back-off efficiency and linearity of the power amplifier. Ordinary class AB power amplifier, the efficiency is seriously reduced at the back-off point, and the overall power consumption is large. Therefore, it is necessary to improv...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H03F1/02H03F1/32H03F3/19H03F3/21
CPCH03F1/0288H03F1/32H03F3/19H03F3/211Y02D30/70
Inventor 狄皓月黄飞
Owner 优镓科技(苏州)有限公司