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US 9,780,727 B2Granted
Frequency modulator and magnetic resonance tomography system with a frequency modulator
AssigneeSiemens Aktiengesellschaft
InventorRalph Oppelt
Life of this patent
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Abstract
A frequency modulator includes a first pair of diodes with two capacity diodes, and a second pair of diodes with two additional capacity diodes. The second pair of diodes is employed in parallel. The frequency modulator also includes a first modulator input for reception of a first modulation signal and a second modulator input for reception of a symmetrical second modulation signal. Both pairs of diodes are coupled to an oscillator unit.
Claims21
A frequency modulator for providing a communication signal that is frequency-modulated, the frequency modulator comprising:
- a first modulator input for a first modulation signal for specification of a frequency modulation for the communication signal;
- a second modulator input for a second modulation signal symmetrical to the first modulation signal;
- an oscillator unit coupled with the first modulator input, the oscillator unit being configured, dependent on the first modulation signal and the second modulation signal, to generate the frequency-modulated communication signal at an oscillator output;
- a first capacitive pair of elements with two serially connected capacity elements, a first element of the first capacitive pair of elements being coupled to the oscillator unit and a second element of the first capacitive pair of elements being coupled to a reference potential, wherein a first node between the two serially connected capacity elements is coupled to the first modulator input so that the first modulation signal is suppliable at the first node;
- and
- a second capacitive pair of elements connected in parallel to the first capacitive pair of elements, the second capacitive pair of elements comprising two capacity elements serially connected to each other, a third element of the second capacitive pair of elements being coupled to the oscillator unit via a first coupling capacitor and a fourth element of the second capacitive pair of elements being coupled to the reference potential via a second coupling capacitor, wherein a second node between the two capacity elements of the second capacitive pair of elements is coupled to the second modulator input, so that the second modulation signal is suppliable at the second node,
- the first coupling capacitor between the third element of the second capacitive pair of elements and both of the first element of the first capacitive pair of elements and the oscillator unit, and the second coupling capacitor between the fourth element of the second capacitive pair of elements and both the second element of the first capacitive pair of elements and the reference potential.
4 more elements
A magnetic resonance tomography system comprising:
- a frequency modulator for providing a communication signal that is frequency-modulated, the frequency modulator comprising:
- a first modulator input for a first modulation signal for specification of a frequency modulation for the communication signal;
- a second modulator input for reception of a second modulation signal symmetrical to the first modulation signal;
- an oscillator unit coupled with the first modulator input, the oscillator unit comprising an LC-oscillating circuit configured, dependent on the first modulation signal and the second modulation signal, to generate the frequency-modulated communication signal at an oscillator output;
- a first capacitive pair of elements with two serially connected capacity elements, a first element of the first capacitive pair of elements being coupled to the oscillator unit and a second element of the first capacitive pair of elements being coupled to a reference potential, wherein a first node between the two serially connected capacity elements is coupled to the first modulator input so that the first modulation signal is suppliable at the first node;
- and
- a second capacitive pair of elements connected in parallel to the first capacitive pair of elements, the second capacitive pair of elements comprising two capacity elements serially connected to each other, a third element of the second capacitive pair of elements being coupled to the oscillator unit and a fourth element of the second capacitive pair of elements being coupled to the reference potential, wherein a second node between the two capacity elements of the second capacitive pair of elements is coupled to the second modulator input, so that the second modulation signal is suppliable at the second node.
4 more elements
Dependencies are inferred from the claim text.