Recherche dans les collections de brevets nationales et internationales
Une partie du contenu de cette demande n'est pas disponible pour le moment.
Si cette situation persiste, contactez-nous auObservations et contact
1. (WO2015171026) CIRCUIT AMPLIFICATEUR ET PROCÉDÉ
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. An amplifier circuit comprising:

a first amplifier (11) configured to amplify a first input signal (10), wherein an output of the first amplifier (11) is coupled to an output node (15) via a first transmission line (13), the first transmission line (13) comprising a first portion

(13^ having a first characteristic impedance and a first length, and a second portion (132) having a second characteristic impedance and a second length;

a second amplifier (21) configured to amplify a second input signal (20), wherein an output of the second amplifier (21) is coupled to the output node (15) via a second transmission line (23), the second transmission line (23) comprising a first portion (23^ having a first characteristic impedance and a first length, and a second portion (232) having a second characteristic impedance and a second length; and

an auxiliary amplifier (31) configured to amplify a third input signal (30), wherein an output of the auxiliary amplifier (30) is coupled to an auxiliary transmission line network (33) comprising:

a first auxiliary transmission line (33^ coupled between an auxiliary junction (37) and a first intersection between the first and second portions (13i, 132) of the first transmission line (13);

a second auxiliary transmission line (332) coupled between the auxiliary junction (37) and a second intersection between the first and second portions (23^ 232) of the second transmission line (23); and a third auxiliary transmission line (333) for coupling the output of the auxiliary amplifier (31) to the auxiliary junction (37); wherein for each of the first and second transmission lines (13, 23,) the first and second portions consist of a higher-impedance portion and a lower- impedance portion whose lengths are substantially equal; and

wherein the lengths of the respective first portions (13i , 23^ of the first and second transmission lines (13, 23) sum to half a wavelength, and the lengths of the respective second portions (132, 232) of the first and second transmission lines (13, 23) sum to half a wavelength.

2. An amplifier circuit as claimed in claim 1 , wherein the length of each of the first and second auxiliary transmission lines (33! , 332) is three quarters of a wavelength minus the length of the second portion (132, 232) of the respective transmission line which connects the auxiliary transmission line to the output (15).

3. An amplifier circuit as claimed in claim 2, wherein the total length from the auxiliary junction (37) to the output (15) through any path is equal to three quarter wavelengths.

4. An amplifier circuit as claimed in any one of the preceding claims, wherein the third auxiliary transmission line (333) for coupling the output of the auxiliary amplifier (31) to the auxiliary junction (37) comprises a quarter wavelength transmission line.

5. An amplifier circuit as claimed in claim 4, wherein the total length from the output of the auxiliary amplifier (31) to the output (15) through both its paths is equal to one wavelength.

6. An amplifier circuit as claimed in any one of the preceding claims, wherein the first amplifier (1 1), second amplifier (21) and auxiliary amplifier (31) are of substantially the same size.

7. An amplifier circuit as claimed in any one of claims 1 to 4, wherein the first amplifier (11) and second amplifier (21) are of substantially the same size, and the auxiliary amplifier (31) increased in size compared to the first and second amplifiers (1 1 , 21).

8. An amplifier circuit as claimed in claim 7, wherein the auxiliary amplifier (31) is increased in size by about 1.6 times, or by about 1.3 times, compared to the first and second amplifiers (1 1 , 21).

9. An amplifier circuit as claimed in claim 7 or 8, wherein an impedance of the third auxiliary transmission line (333) is decreased relative to the impedance of a

transmission line (13i , 23^ connected to the first or second amplifier (1 1 , 21), by an amount proportional to the increase in size of the auxiliary amplifier (31 ).

10. An amplifier circuit as claimed in any one of the preceding claims, wherein a slight asymmetry is introduced into at least one of the transmission line lengths, such that the fixed equal lengths and half wavelength relationships are offset.

1 1 . An amplifier circuit as claimed in any one of the preceding claims, wherein the auxiliary amplifier (31 ) comprises first and second auxiliary amplifiers (31 ^ 312), and wherein the first auxiliary amplifier (31 ^ is coupled via a fourth auxiliary transmission line (334) to a third auxiliary transmission line (333), and the second auxiliary amplifier (312) coupled via a fifth auxiliary transmission line (335) to the third auxiliary transmission line (333).

12. An amplifier circuit as claimed in claim 1 1 , wherein the first amplifier (1 1 ) and second amplifier (21 ) are of substantially the same size, and wherein the first auxiliary amplifier (311) and second auxiliary amplifier (312) are of substantially the same size but larger than the first and second amplifiers (1 1 , 21 ).

13. An amplifier circuit as claimed in claim 12, wherein the first and second amplifiers (1 1 , 21 ) are about 50% of the size of the first auxiliary amplifier (311) and second auxiliary amplifier (312).

14. An amplifier circuit as claimed in claim 1 1 , wherein the first amplifier (1 1), second amplifier (21), first auxiliary amplifier (31 ^ and second auxiliary amplifier (312) are of substantially the same size.

15. An amplifier circuit as claimed in any one of claims 1 to 10, further comprising a fourth amplifier (41 ) configured to amplify a fourth input signal (40), wherein an output of the fourth amplifier (41) is coupled either directly to the output node (15), or via a half wavelength transmission line or multiple thereof.

16. An amplifier circuit as claimed in any one of claims 1 to 10, wherein the auxiliary amplifier (31) comprises an amplifier circuit as claimed in any one of claims 1 to 10 to provide a five-stage amplifier circuit.

17. A method in an amplifier circuit, the method comprising the steps of:

amplifying a first input signal (10) using a first amplifier (1 1), and coupling the amplified first input signal to an output node (15) via a first transmission line (13), the first transmission line (13) comprising a first portion (13^ having a first characteristic impedance and a first length, and a second portion (132) having a second characteristic impedance and a second length (step 1001);

amplifying a second input signal (20) using a second amplifier (21), and coupling the amplified second input signal to the output node (15) via a second transmission line (23), the second transmission line (23) comprising a first portion (23^ having a first characteristic impedance and a first length, and a second portion (232) having a second characteristic impedance and a second length (step 1003); and

amplifying a third input signal (30) using an auxiliary amplifier (31), and coupling the output of the auxiliary amplifier (30) to an auxiliary transmission line network (33! , 332; 333, 334, 335) comprising:

a first auxiliary transmission line (33^ coupled between an auxiliary junction (37) and a first intersection between the first and second portions (13i, 132) of the first transmission line (13);

a second auxiliary transmission line (332) coupled between the auxiliary junction (37) and a second intersection between the first and second portions (23^ 232) of the second transmission line (23); and a third auxiliary transmission line (333) for coupling the output of the auxiliary amplifier (31) to the auxiliary junction (37); wherein for each of the first and second transmission lines (13, 23,) the first and second portions consist of a higher-impedance portion and a lower- impedance portion whose lengths are substantially equal; and

wherein the lengths of the respective first portions (13i , 23^ of the first and second transmission lines (13, 23) sum to half a wavelength, and the lengths of the respective second portions (132, 232) of the first and second transmission lines (13, 23) sum to half a wavelength.