Arrangement for signal conversion

An arrangement for converting an analog acquisition signal into a digital signal, comprising:

• a local coil of a magnetic resonance apparatus that acquires an analog acquisition signal;
• a low-noise amplifier having an input configured for connection to an output of the acquisition coil to receive the analog acquisition signal at the input of the amplifier, said amplifier amplifying said analog acquisition signal to form an amplified analog acquisition signal that is emitted at an output of the amplifier;
• an analog-to-digital converter having an input connected to the output of the amplifier, said analog-to-digital converter converting said amplified analog acquisition signal into a corresponding digital signal that is emitted at an output of the analog-to-digital converter;
• said analog-to-digital converter being a delta-sigma modulator that forms a digital data stream with a width of one bit, as said digital signal, from said amplified acquisition signal;
• a signal splitter having an input connected to the output of said amplifier, to which the amplified analog acquisition signal is supplied, said signal splitter forming two sub-signals, that are phase-shifted relative to each other, from said amplified analog acquisition signal;
• said delta-sigma modulator comprising a first low pass delta-sigma modulator and a second low pass delta-sigma modulator;
• identical first and second mixers respectively connected between said signal splitter and said first and second low pass delta-sigma modulators, a first of said sub-signals being supplied to said first low pass delta-sigma modulator via said first mixer and a second of said sub-signals being supplied to said second low pass delta-sigma modulator via said second mixer;
• and
• said first and second mixers converting the respective sub-signals into a lower intermediate frequency range.

An arrangement for converting an analog acquisition signal, into a digital signal comprising:

• a local coil of a magnetic resonance apparatus that acquires an analog acquisition signal;
• a low-noise amplifier having an input configured for connection to an output of the acquisition coil to receive the analog acquisition signal at the input of the amplifier, said amplifier amplifying said analog acquisition signal to form an amplified analog acquisition signal that is emitted at an output of the amplifier, said amplified analog acquisition signal having a polarity;
• an analog-to-digital converter having an input connected to the output of the amplifier, said analog-to-digital converter converting said amplified analog acquisition signal into a corresponding digital signal that is emitted at an output of the analog-to-digital converter;
• said analog-to-digital converter being a low pass delta-sigma modulator that forms a digital data stream with a width of one bit, as said digital signal, from said amplified acquisition signal;
• and
• a band pass filter and a mixer connected between the output of the amplifier and the input of the low pass delta sigma modulator, said mixer reversing the polarity of said amplified analog acquisition signal.