Electrical circuit comprising a differential signal path and component with such a circuit
View Patent ↗The invention relates to an electrical circuit that includes a first signal path having differential partial paths. An interface circuit arranged in the first signal path suppresses the common-mode signals in a blocking region of the signal path, but essentially does not influence differential signal parts.
1. An electrical circuit comprising:
a first signal path that is designed for data transmission in a frequency range and comprises differential partial paths,
wherein a matching circuit arranged in the first signal path and suppresses common-mode signals outside a passband of the first signal path, wherein the matching circuit essentially does not affect differential signal parts in the passband of the first signal path, and
a second signal path that is designed for data transmission in a second frequency range, wherein the matching circuit suppresses common-mode signals in the second frequency range.
2. The circuit according to claim 1 , wherein the first signal path is a reception path and the second signal path is a transmission path.
3. The circuit according to claim 1 , further comprising:
an antenna circuit and a transceiver circuit that are respectively arranged in the first and in the second signal paths,
wherein the matching circuit is arranged between a reception output of the antenna circuit and a reception input of the transceiver circuit.
4. The circuit according to claim 1 ,
wherein the matching circuit comprises at least one shunt arm that connects the differential partial paths to one another, and
wherein the shunt arm comprises at least one grounded series resonant circuit, a resonance frequency of which lies in a blocking region of the first signal path.
5. The circuit according to claim 4 ,
wherein the shunt arm comprises a series circuit of two inductors and a grounded capacitor, wherein the grounded capacitor is connected to an electrical node arranged between the inductors.
6. An electrical circuit comprising:
a first signal path designed for data transmission in a first frequency range and comprising differential partial paths;
a second signal path designed for data transmission in a second frequency range; and
a matching circuit that suppresses common-mode signals outside a passband of the first signal path and suppresses common-mode signals in the second frequency range, wherein the matching circuit essentially does not affect differential signal parts in the passband of the first signal path.
7. A component comprising:
a supporting substrate; and
circuitry attached to the supporting substrate, the circuitry comprising:
a first signal path designed for data transmission in a first frequency range and comprising differential partial paths;
a second signal path designed for data transmission in a second frequency range; and
a matching circuit that suppresses common-mode signals outside a passband of the first signal path and suppresses common-mode signals in the second frequency range,
wherein the matching circuit essentially does not affect differential signal parts in the passband of the first signal path.
8. The component according to claim 7 , wherein the first signal path is a reception path and the second signal path is a transmission path.
9. The component according to claim 7 , wherein the matching circuit comprises at least one shunt arm that connects the differential partial paths to one another, and wherein the shunt arm comprises at least one grounded series resonant circuit, a resonance frequency of which lies in a blocking region of the first signal path.
10. The component according to claim 9 , wherein the shunt arm comprises a series circuit of two inductors and a grounded capacitor, wherein the grounded capacitor is connected to an electrical node arranged between the inductors.
11. The component according to claim 7 , further comprising an antenna circuit and a transceiver circuit that are arranged in the first and second signal paths, wherein the matching circuit is arranged between a reception output of the antenna circuit and a reception input of the transceiver circuit.
12. The component according to claim 11 , wherein the transceiver circuit is formed on a chip that is physically attached to the supporting substrate.
13. The component according to claim 12 , wherein the matching circuit is at least partially realized in the supporting substrate.
14. The component according to claim 13 , wherein at least part of the antenna circuit is realized in the supporting substrate.
15. The component according to claim 13 , wherein at least part of the antenna circuit is realized in a second chip that is physically attached to the supporting substrate.
16. The component according to claim 15 , wherein the antenna circuit comprises a switch that serves to switch between the first signal path and the second signal path.
17. The component according to claim 16 , wherein the switch is fixed on the supporting substrate.