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Capacitive micromachined ultrasonic transducers (CMUTs) are prone to having low transmit sensitivity. According to large signal CMUT models, this shortcoming can be overcome with higher pulse voltages and optimized bipolar pulse drives [1]. Therefore, a supply-inverted bipolar pulser and a Tx/Rx switch are proposed to drive CMUTs in medical ultrasound imaging applications. These circuits are particularly...
3-D imaging ICE catheters with large element counts present design challenges in achieving simultaneous data readout from all elements while significantly reducing cable count for a small catheter diameter. Current approaches such as microbeamformer techniques tend to rely on area and power hungry circuits, making them undesirable for ICE catheters. In this paper, a system which uses are an efficient...
A system-on-a-chip (SoC) for interfacing with a high frequency capacitive micromachined ultrasound transducer (CMUT) imaging array is presented at the post-layout simulation level. The SoC receives high and low voltage supply and clock from external sources and transfers the RF echo signal directly through a single wire. It occupies a 1.26 mm2 chip area in a 0.18-μm high voltage CMOS process and consumes...
An accurate scalable RF CMOS model applicable to high frequencies is developed using 3-D EM-based extraction of parasitic elements for the first time. Due to multi-metal layers, vertical interconnects, substrate loss and substrate-contact rings, the extrinsic parasitic network of CMOS FET is more complicated than GaAs FET's and does not follow simple scaling rules. A pair of dummy patterns with different...
An accurate scalable small-signal RF CMOS model applicable to high frequencies is developed using 3-D electromagnetic (EM)-based extraction of parasitic elements. Due to multimetal layers, vertical interconnects, substrate loss and substrate-contact rings, the extrinsic parasitic network of CMOS field-effect transistor (FET) is more complicated than GaAs FETs and does not follow simple scaling rules...
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