US 12,332,332 B1
Circuit arrangement for correcting an input signal, and MRI-ET hybrid imaging device
Michael Maixner, Bietigheim (DE)
Filed by Bruker BioSpin GmbH & Co. KG, Ettlingen (DE)
Filed on Dec. 11, 2024, as Appl. No. 18/977,220.
Claims priority of application No. 10 2023 212 778.4 (DE), filed on Dec. 15, 2023.
Int. Cl. G01R 33/48 (2006.01); G01R 33/385 (2006.01)
CPC G01R 33/481 (2013.01) [G01R 33/385 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A circuit arrangement for correcting an input signal (S2), wherein the input signal (S2) at an input interface of the circuit arrangement comprises a useful signal (S1) with a useful frequency and an interference signal with an interference frequency, wherein the circuit arrangement comprises:
a high-pass filter with a cutoff frequency,
an inverting operational amplifier circuit connected downstream from the high-pass filter and connected in series with the high-pass filter,
an active rectifier circuit connected downstream from the inverting operational amplifier circuit and connected in series therewith, having two parallel-connected conduction paths, wherein each conduction path comprises a rectifying element,
a summing amplifier circuit connected downstream from the rectifier circuit, wherein the summing amplifier circuit has an inverting input and a non-inverting input, and each conduction path is electrically connected to one of the inputs of the summing amplifier circuit.