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Integrated low-power CMFB-free variable-gain amplifier for ultrasound diagnostic applications

机译:集成低功耗,无CMFB的可变增益放大器,用于超声诊断应用

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An integrated current-feedback variable-gain amplifier (VGA) suitable for low-power ultrasound diagnostic applications is presented in this paper, which provides variable gain to accommodate large input dynamic range of ultrasonic receiver. With a proposed active feedback technique, the amplifier maintains a constant bandwidth at different gain levels. Signal distortion due to the bandwidth shift is thus avoided. Compared to most Bipolar and BiCMOS counterparts, the proposed VGA is implemented in a low-cost CMOS process, without compromising the performance. In addition, it employs a resistive feedback network to automatically set the output DC voltage, without using any extra common-mode feedback (CMFB) circuits, making the design simple and effective. The proposed VGA was fabricated and tested with a standard 0.35-μm CMOS process, with an active die area of only 0.052 mm2. The static power dissipation is 2.18 mW with a power supply of 3.0 V. The VGA exhibits a constant bandwidth of 4.5 MHz with a variable gain ranging from 0 to 46 dB. The system is well stabilized with a phase margin of 71.3° at the worst case. Comparisons to the state-of-the-arts demonstrate very competitive performance of this work.
机译:本文提出了一种适用于低功率超声诊断应用的集成电流反馈可变增益放大器(VGA),它提供可变增益以适应超声接收器的大输入动态范围。利用提出的有源反馈技术,放大器可以在不同的增益水平下保持恒定的带宽。因此避免了由于带宽偏移引起的信号失真。与大多数Bipolar和BiCMOS同类产品相比,拟议的VGA采用低成本CMOS工艺实现,而不会影响性能。此外,它采用电阻反馈网络自动设置输出直流电压,而无需使用任何额外的共模反馈(CMFB)电路,从而使设计简单有效。拟议的VGA使用标准的0.35-μmCMOS工艺制造和测试,其有源芯片面积仅为0.052 mm 2 。电源电压为3.0 V时,静态功耗为2.18mW。VGA的带宽为4.5 MHz,可变增益范围为0至46 dB。在最坏的情况下,系统具有很好的稳定性,相位裕度为71.3°。与最新技术的比较证明了这项工作的竞争优势。

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