Design of a 5 T Non-magnetic Magnetic Resonance Radio Frequency Power Amplifier

doi:10.11938/cjmr20212958

Abstract

Abstract:

This paper introduces the design and implementation of a 5 T magnetic resonance radio frequency power amplifier (RFPA), which can be used in scan rooms without a circulator. The RFPA was designed based on laterally-diffused metal-oxide semiconductor (LDMOS) power tube with high standing wave tolerance, and it contained a three-stage amplifier circuit. The transmission line transformers with magnetic core in RFPA was designed as non-magnetic. The reflected power was monitored tensely. The nonlinear automatic correction of RFPA was realized by using analogic negative feedback technology. The results showed that the output of RFPA power is up to 2 kW, the gain linearity performance is less than or equal to 1 dB, and the phase linearity performance is less than or equal to 10 deg over 40 dB range up to rated power during the load disturbance (reflection coefficient Г < 0.5), which meets the imaging requirements. Thus the rationality and feasibility of the proposed design scheme are verified.

Key words: magnetic resonance imaging (MRI), power amplifier, non-magnetic, negative feedback

CLC Number:

O482.53

Jun LUO, Sheng-ping LIU, Xing YANG, Jia-sheng WANG, Ye LI. Design of a 5 T Non-magnetic Magnetic Resonance Radio Frequency Power Amplifier[J]. Chinese Journal of Magnetic Resonance, 2022, 39(2): 163-173.

Figures/Tables 13

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Table 1

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性能指标名称	自研功放的性能	Analogic AN8120的性能^[24]
工作频率	210.78±0.5 MHz	63.86±0.650 MHz
平坦度	±0.4 dB	±0.4 dB
上升时间	450 ns (0~90%)	50 μs
下降时间	200 ns (100%~10%)	10 μs
增益线性度（40 dB动态输入范围）	0.8 dB	< =1 dB
相位线性度（40 dB动态输入范围）	6?	< = 10?
谐波输出	?57.5 dBc@64.35 dBm^2nd ?61.38 dBc@64.35 dBm^3rd	< ?30 dBc@73 dBm
激发态噪声	?96.485 dbm/Hz	< ?70 dBm/Hz
非激发态（自由）噪声	?158.936 dBm/Hz	< ?160 dBm/Hz

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