This paper concerns the design and implementation of an integrated front-end preamplifier dedicated to ultrasonic receivers. A new preamplification technique composed of a logarithmic amplifier and followed by a programmable-gain amplifier is proposed. The logarithmic amplifier, based on a True Logarithmic Amplifier (TLA) technique, largely amplifies small amplitude signals, and moderately the large amplitude ones. The programmable-gain amplifier, based on Timing Gain Compensator (TGC), is used to compensate signal attenuation caused by its traveling several human body tissues. Spectre simulations of both the TLA and TGC show unity gain bandwidths of 100 MHz and 127 MHz respectively when driving a load of 1 pF. The implementation of this system (TLA, TGC) is done using CMOS 0.35 /spl mu/m technology. The total chip area is 7.2 mm/sup 2/ including the digital part needed to program the TGC.
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机译：本文涉及专用于超声接收器的集成前端前置放大器的设计和实现。提出了一种新的前置放大技术，该技术包括对数放大器和可编程增益放大器。对数放大器基于真实对数放大器（TLA）技术，在很大程度上放大了小幅度信号，并适度放大了大幅度信号。基于定时增益补偿器（TGC）的可编程增益放大器，用于补偿由于其在多个人体组织中传播而引起的信号衰减。当驱动1 pF的负载时，TLA和TGC的频谱仿真分别显示了100 MHz和127 MHz的单位增益带宽。该系统（TLA，TGC）的实现是使用CMOS 0.35 / spl mu / m技术完成的。总芯片面积为7.2 mm / sup 2 /，其中包括对TGC进行编程所需的数字部分。
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