Bias circuit
A technology of bias circuit and bias power supply, which is applied in the radio frequency field and can solve the problem of low linearity of the bias circuit
Pending Publication Date: 2022-07-29
RADROCK (SHENZHEN) TECH CO LTD
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Problems solved by technology
[0004] An embodiment of the present invention provides a bias circuit to solve the problem of low linearity in existing bias circuits
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[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0034] It should be understood that the present invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. Like ...
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The invention discloses a bias circuit. The bias circuit comprises a bias power supply end, a first bias transistor and a protection circuit, a first node of the first bias transistor is coupled to a bias power supply end and is configured to receive a first bias signal output by the bias power supply end, a second node of the first bias transistor is configured to output a second bias signal to the power amplifier, and a third node of the first bias transistor is coupled to a first power supply end; and the protection circuit is connected with the bias power supply end and is configured to prevent the alternating current signal from flowing to the bias power supply end. According to the invention, the protection circuit is connected to the bias power supply end, and the protection circuit can prevent an alternating current signal flowing back in the bias circuit from flowing into the bias power supply end on the premise that the bias power supply end outputs the first bias signal to the first bias transistor, so that the influence of the alternating current signal on the bias power supply end is avoided; therefore, the linearity of the bias circuit is improved, and the linearity of the whole radio frequency circuit is improved.
Description
technical field [0001] The present invention relates to the field of radio frequency technology, and in particular, to a bias circuit. Background technique [0002] With the rapid development of wireless communication systems, the industry has higher and higher demands on the performance of wireless communication systems. In a wireless communication system, the power amplifier is the core component of the transmitter in the wireless communication system. In order to enable the power amplifier to work normally, it is usually necessary to design a corresponding bias circuit to provide bias signals for the transistors in the power amplifier. [0003] At present, there is a problem of low linearity in the existing bias circuit, which leads to low linearity of the entire radio frequency circuit. SUMMARY OF THE INVENTION [0004] Embodiments of the present invention provide a bias circuit to solve the problem of low linearity in the existing bias circuit. [0005] A bias circu...
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Patent Timeline
Login to View More IPC IPC(8): H03F1/32H03F1/52H03F3/195H03F3/213
CPCH03F1/32H03F1/52H03F3/195H03F3/213H03F2200/451
Inventor 饶雪琴陈炉星李铖方建赖晓蕾倪建兴
Owner RADROCK (SHENZHEN) TECH CO LTD