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本文提出了一款采用BCD6-SOI工艺的线性功率放大器，用于超声成像发射器，实现了90Vpp输出摆幅和720MHz增益带宽积（GBW）。该设计解决了超声谐波成像中对高输出功率、高工作频率以及高线性度的需求，有效抑制了二次谐波。
Transducer drivers for ultrasound imaging are required to have high output power and operation frequency into the MHz range. Furthermore, in harmonic imaging, a well-established method resulting in enhanced contrast, higher harmonic echoes (usually the second) of the fundamental transmitted frequency, either generated by reflection from micro-bubbles or on propagation, are selectively detected and used for imaging [1]. As a consequence, the second harmonic of the transmitted signal is suppressed as much as possible and the received signal is derived solely from the nonlinear behavior of the body. Pulsers are usually adopted having high efficiency, being simple and lending themselves to harmonic imaging for example by means of out-of-phase pulse transmission techniques [1]. Output signals with arbitrary shape allow better performances, enabling apodization profiles with high resolution, beams with low harmonic
Dario Bianchi1, Fabio Quaglia2, Andrea Mazzanti1, Francesco Svelto1
University of Pavia, Pavia, Italy, 2STMicroelectronics, Cornaredo, Italy