Push-push oscillator circuit
View Patent ↗A push-push oscillator circuit with a first oscillation branch with a first active device and a first tank adapted to provide a signal having a fundamental frequency f 0 , a second oscillation branch with a second active device and a second tank symmetrical to the first oscillation branch and adapted to provide a signal having the fundamental frequency f 0 . Output branches are coupled to the first oscillation branch and the second oscillation branch to provide signals having the second harmonic frequency 2f 0 of the fundamental signal based on the signals having the fundamental frequency f 0 and/or to provide signals having the fundamental frequency f 0 ; The push-push oscillator circuit further comprises at least one terminal branch with a terminal adapted to provide a component of a differential signal having the second harmonic frequency 2f 0 or the fundamental frequency f 0 . The at least one terminal branch comprises a RF stub.
1. A push-push oscillator circuit, comprising:
a first output terminal to provide a first component of a differential signal having a fundamental frequency f 0 ;
a second output terminal to provide a second component of the differential signal having the fundamental frequency f 0 ;
a third output terminal to provide a first component of a differential signal having a second harmonic frequency 2f 0 ;
a fourth output terminal to provide a second component of the differential signal having the second harmonic frequency 2f 0 ;
a first oscillation branch with a first active device and a first tank adapted to provide a signal having the fundamental frequency f 0 ;
a second oscillation branch with a second active device and a second tank symmetrical to the first oscillation branch and adapted to provide a signal having the fundamental frequency f 0 ;
output branches coupled to the first oscillation branch and the second oscillation branch to provide signals having the second harmonic frequency 2f 0 based on signals having the fundamental frequency f 0 and/or to provide signals having the fundamental frequency f 0 ; and
at least one terminal branch including
a RF stub comprising a quarter-wavelength transmission line and a corresponding capacitor for a signal having the second harmonic frequency 2f 0 or the fundamental frequency f 0 .
2. The push-push oscillator circuit according to claim 1 , wherein the quarter-wavelength transmission line for a signal having the second harmonic frequency 2f 0 or the fundamental frequency f 0 of the RF stub comprises a microstrip.
3. The push-push oscillator circuit according to claim 2 , wherein the RF stub is coupled to a connection point between an inductor of the at least one terminal branch and the terminal.
4. The push-push oscillator circuit according to claim 2 , wherein the RF stub comprises a capacitor coupled in series with the quarter-wavelength transmission line.
5. The push-push oscillator circuit according to claim 1 , wherein the RF stub is coupled to a connection point between an inductor of the at least one terminal branch and the terminal.
6. The push-push oscillator circuit according to claim 1 , wherein the RF stub comprises a capacitor coupled in series with the quarter-wavelength transmission line.
7. The push-push oscillator circuit according to claim 1 , wherein the fundamental frequency f 0 lies in a range between 10 GHz to 10 THz.
8. A push-push oscillator circuit, comprising:
a first oscillation branch with a first active device and a first tank adapted to provide a signal having a fundamental frequency f 0 ;
a second oscillation branch with a second active device and a second tank, the second oscillation branch symmetrical to the first oscillation branch and adapted to provide a signal having the fundamental frequency f 0 ;
a first output branch coupled to the first oscillation branch, the first output branch including a first coupling inductor connected between the first oscillation branch and a first connection point, a second coupling inductor connected between the first connection point and a second connection point, and a first fundamental frequency branch connected between the second connection point and a first fundamental frequency terminal, the first fundamental frequency terminal to provide a first component of a differential signal having a fundamental frequency f 0 ; and
a second output branch coupled to the second oscillation branch, the second output branch including a third coupling inductor connected between the second oscillation branch and a third connection point, a fourth coupling inductor connected between the third connection point and a fourth connection point, and a second fundamental frequency branch connected between the fourth connection point and a second fundamental frequency terminal, the second fundamental frequency terminal to provide a second component of the differential signal having the fundamental frequency f 0 .
9. The push-push oscillator circuit according to claim 8 , further comprising:
a first terminal branch including a first second harmonic frequency terminal, the first second harmonic frequency terminal to provide a first component of a differential signal having a second harmonic frequency 2f 0 ; and
a second terminal branch including a second second harmonic frequency terminal, the second second harmonic frequency terminal to provide a second component of the differential signal having the second harmonic frequency 2f 0 ;
wherein the first terminal branch is connected to the first connection point by a first capacitor, and is connected to the third connection point by a second capacitor; and
wherein the second terminal branch is connected to the first oscillation branch by a third output branch, and is connected to the second oscillation branch by a fourth output branch.
10. The push-pull oscillator of claim 9 , further comprising:
a second RF stub connected between the first second harmonic frequency terminal and a ground, the first RF stub including a quarter-wave transmission line for a signal having the second harmonic frequency 2f 0 .
11. The push-push oscillator circuit according to claim 9 , wherein the second terminal branch includes a decoupling capacitor connected in series with an inductor, the inductor to provide a phase shift.
12. The push-push oscillator circuit according to claim 8 , wherein the first connection point and the third connection point are coupled via a connection branch including a first capacitor and a second capacitor.
13. The push-push oscillator circuit according to claim 12 , wherein the first capacitor and the second capacitor are adapted to provide signals having the second harmonic frequency 2f 0 with the same phase.
14. The push-push oscillator according to claim 8 , wherein each of the first, second, third, and fourth coupling inductors comprise a microstrip.
15. The push-push oscillator circuit according to claim 8 , further comprising a first grounding inductor connected between the second connection point and a ground, and a second grounding inductor connected between the fourth connection point and ground.
16. The push-push oscillator according to claim 15 , wherein each of the first grounding inductor comprises a microstrip and the second grounding inductor comprises a microstrip.
17. The push-push oscillator circuit according to claim 8 , wherein the fundamental frequency f 0 lies in a range between 10 GHz to 10 THz.
18. The push-pull oscillator of claim 8 , further comprising:
a first RF stub connected between the first fundamental frequency terminal and a ground, the first RF stub including a quarter-wave transmission line for a signal having the fundamental frequency f 0 .
19. The push-pull oscillator of claim 8 , further comprising:
a third output branch including an inductor connected between the first oscillation branch and a fifth connection point;
a fourth output branch including an inductor connected between the second oscillation branch and the fifth connection point; and
a biasing branch connected to the fifth connection point, the biasing branch including a quarter-wave transmission line for a signal having the second harmonic frequency 2f 0 .