Integrated circuit having a mixer circuit
View Patent ↗Integrated circuit including a mixer circuit, which has a first circuit section, a second circuit section, and a transformer. The first circuit section has two radiofrequency terminals. The second circuit section has two reference oscillator terminals, an active mixer unit with a signal-amplifying unit, and two intermediate frequency terminals. The active mixer unit and the signal-amplifying unit have a common current path. The transformer directly electrically decouples the two radiofrequency terminals from the active mixer unit, and couples the first circuit section and the second circuit section together such that each of the two circuit sections is separately supplied with a full operating voltage of the integrated circuit. The integrated circuit may additionally include a second transformer connected between the active mixer unit and the two intermediate frequency terminals.
1. An integrated circuit, comprising:
a mixer circuit, which has a first circuit section and a second circuit section;
the first circuit section having two radiofrequency terminals;
the second circuit section having two reference oscillator terminals, an active mixer unit with a signal-amplifying unit, and two intermediate frequency terminals, wherein the active mixer unit and the signal-amplifying unit have a common current path;
a transformer that directly electrically decouples the two radiofrequency terminals from the active mixer unit, and couples the first circuit section and the second circuit section together such that each of the two circuit sections is separately supplied with a full operating voltage of the integrated circuit; and
wherein the first circuit section further comprises at least one filter element connected between the radiofrequency terminals and the transformer, and the at least one filter element is connected to the full operating voltage of the integrated circuit.
2. The integrated circuit as claimed in claim 1 , wherein the signal-amplifying unit is an input amplifier of the active mixer unit.
3. The integrated circuit as claimed in claim 1 , further comprising an amplifier circuit located between the two radiofrequency terminals and the transformer.
4. The integrated circuit as claimed in claim 1 , wherein the filter element has a cascode.
5. The integrated circuit as claimed in claim 1 , wherein the filter element has a bandpass filter.
6. The integrated circuit as claimed in claim 5 , wherein the bandpass filter is realized by at least one capacitor.
7. The integrated circuit as claimed in claim 1 , further comprising a cascode connected between the two radiofrequency terminals and the transformer.
8. The integrated circuit as claimed in claim 1 , further comprising a cascode connected between the transformer and the active mixer unit.
9. The integrated circuit as claimed in claim 1 , further comprising a cascode connected between the active mixer unit and the two intermediate frequency terminals.
10. The integrated circuit as claimed in claim 1 , wherein the transformer is a monolithic transformer.
11. The integrated circuit as claimed in claim 1 , further comprising a control element that sets the operating point of the integrated circuit.
12. The integrated circuit as claimed in claim 11 , wherein the control element is a controllable inductive component.
13. The integrated circuit as claimed in claim 1 , wherein at least one of the active mixer unit, the amplifier circuit, and a cascode has at least one field effect transistor.
14. The integrated circuit as claimed in claim 1 , wherein the mixer circuit is a Gilbert mixer.
15. An integrated circuit, comprising:
a mixer circuit, which has a first circuit section and a second circuit section;
the first circuit section having two radiofrequency terminals;
the second circuit section having two reference oscillator terminals, an active mixer unit with a signal-amplifying unit, and two intermediate frequency terminals, wherein the active mixer unit and the signal-amplifying unit have a common current path;
a first transformer that directly electrically decouples the two radiofrequency terminals from the active mixer unit, and couples the first circuit section and the second circuit section together such that each of the two circuit sections is separately supplied with a full operating voltage of the integrated circuit; and
a second transformer connected between the active mixer unit and the two intermediate frequency terminals.
16. The integrated circuit as claimed in claim 15 , wherein the second transformer is a monolithic transformer.
17. The integrated circuit as claimed in claim 15 , wherein the signal-amplifying unit is an input amplifier of the active mixer unit.
18. The integrated circuit as claimed in claim 15 , further comprising an amplifier circuit connected between the two radiofrequency terminals and the transformer.
19. The integrated circuit as claimed in claim 15 , further comprising at least one filter element connected between the radio frequency terminals and the first transformer.
20. The integrated circuit as claimed in claim 19 , wherein the filter element has a cascode.
21. The integrated circuit as claimed in claim 19 , wherein the filter element has a bandpass filter.
22. The integrated circuit as claimed in claim 21 , wherein the bandpass filter is realized by at least one capacitor.
23. The integrated circuit as claimed in claim 15 , further comprising a cascode connected between the two radiofrequency terminals and the transformer.
24. The integrated circuit as claimed in claim 15 , further comprising a cascode connected between the transformer and the active mixer unit.
25. The integrated circuit as claimed in claim 15 , further comprising a cascode connected between the active mixer unit and the two intermediate frequency terminals.
26. The integrated circuit as claimed in claim 15 , wherein each of the first transformer and the second transformer is a monolithic transformer.
27. The integrated circuit as claimed in claim 15 , further comprising a control element that sets the operating point of the integrated circuit.
28. The integrated circuit as claimed in claim 27 , wherein the control element is a controllable inductive component.
29. The integrated circuit as claimed in claim 15 , wherein at least one of the active mixer unit, the amplifier circuit, and a cascode has at least one field effect transistor.
30. The integrated circuit as claimed in claim 15 , wherein the mixer circuit is a Gilbert mixer.