Small footprint high gain and low noise figure preamplifier for 7T MRI scanner

Document Type

Conference Proceeding

Publication Date



Canadian Conference on Electrical and Computer Engineering

URL with Digital Object Identifier



This work presents the design and construction of a low input impedance preamplifier with a gain of more than 30 dB and a noise figure of less than 1 dB. It has a low input impedance, around 1Ω. A λ/4 transmission line is used to transform the low input impedance of the preamplifier to a high impedance at the coil to reduce the cross-coupling between coils. In order to test the preamplifier, a single-transmit, single-receive coil was developed at 297.2 MHz. The designed preamplifier can have a footprint as small as 27 mm × 13 mm. Small footprint preamplifiers are crucial where space is at a premium in multichannel coil arrays.