Gated RF preamplifier for use in pulsed radiofrequency electron paramagnetic resonance and MRI

US5828216A · kind A · utility

Assignee

• The United States of America, as represented by the Department of Health and Human Services · US

Inventors

• Rolf G. Tschudin · Kensington, US
• Ramachandran Murugesan · Rockville, US
• Murali K. Cherukuri · North Potomac, US
• James B. Mitchell · Damascus, US
• Sankaran Subramanian · Kothagudem, IN

Key dates

• Filing date: Aug 19, 1996
• Grant date: Oct 27, 1998
• Expiry date: Aug 19, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/60
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gated RF preamplifier used in system for performing pulsed RF FT EPR spectroscopy and imaging or MRI. The RF preamplifier does not overload during a transmit cycle so that recovery is very fast to provide for ultra-fast data acquisition in an ultra-fast excitation subsystem. The preamplifier includes multiple low-gain amplification stages with high-speed RF gates inserted between stages that are switched off to prevent each stage from overloading during the transmit cycle.