US 12,253,584 B2
Radio frequency receiver system
Filips Van Liere, Best (NL); and Sotir Filipov Ouzounov, Eindhoven (NL)
Assigned to Koninklijke Philips N.V., Eindhoven (NL)
Appl. No. 18/031,013
Filed by KONINKLIJKE PHILIPS N.V., Eindhoven (NL)
PCT Filed Sep. 26, 2021, PCT No. PCT/EP2021/076424
§ 371(c)(1), (2) Date Apr. 10, 2023,
PCT Pub. No. WO2022/078739, PCT Pub. Date Apr. 21, 2022.
Claims priority of application No. 20201432 (EP), filed on Oct. 13, 2020.
Prior Publication US 2023/0375646 A1, Nov. 23, 2023
Int. Cl. G01R 33/36 (2006.01)
CPC G01R 33/3621 (2013.01) [G01R 33/3607 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A radio frequency (RF) receiver system for providing magnetic resonance (MR) information from an examination space of a MR imaging system, comprising:
at least one RF coil with at least one connection port for receiving an analog MR information signal,
at least one analog to digital converter (ADC), which is connected to the at least one connection port and which converts the analog MR information signal into a digital MR information signal, whereby the at least one ADC is a single-bit sigma delta ADC, the single-bit sigma delta ADC comprising a loop filter (LF), a quantizer unit (QUANT) for quantizing the analog MR information signal and a variable output strength feedback digital to analog converter (DAC) unit,
the RF receiver system further comprising a signal processing chain, the signal processing chain comprising a first digital down convertor (DDC1), the first DDC being arranged to convert the digital MR information signal at an ADC sampling frequency (FADC) to an intermediate sampling frequency (FAGC), and at least a second DDC (DDC2), the second DDC (DDC2) being configured to convert the signal at the intermediate sampling frequency (FAGC) to a baseband sampling frequency (FBaseband),
at least one automatic gain control (AGC) circuit, wherein the AGC circuit is arranged after the first DDC (DDC1) and configured to operate at the intermediate sampling frequency (FAGC), to track the temporal magnitude of the MRI signal and to adjust the digital to analog converter (DAC) unit's gain (GDAC) accordingly,
at least one feedback control, the feedback control being configured to operate at the intermediate sampling frequency (FAGC) and for adjusting a DAC output strength as a function of the temporal magnitude of the MRI signal.