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US 2015/0091646 A1Published application
Current mode class ab low-noise amplifier and method of active cable termination
AssigneeSupertex, Inc.
InventorLazar Shifrin
Life of this patent
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Abstract
This invention relates to medical ultrasonic imaging systems and, in particular, phased array imaging systems operating in different scan formats and imaging modalities. More specifically, the invention relates to the front-end processing of ultrasonic echoes.
Claims17
A low-noise amplifier (LNA) for receiving ultrasonic echo signals from a piezo-electric transducer via a coaxial cable having different characteristic impedance said LNA comprising:
- an input terminal, an output terminal, and a transconductor circuit sequentially connected to a current-to-voltage (I-to-V) converter, wherein the transconductance parameter of said transconductor circuit is operable to match the characteristic impedance of the cable.
A method for receiving ultrasonic echo signals from a piezo-electric transducer via coaxial cable with different characteristic impedance, the method comprising:
- a) converting bipolar echo signals into RF current by means of a transconductor operating in class AB;
- b) transforming said RF current into a voltage signal.
Dependencies are inferred from the claim text.