Decomposer and amplifier
View Patent ↗A quadrature out-phasing system comprising: a first baseband signal modifier ( 6 ) arranged to receive a first baseband signal component ( 2 ) and output a first constant envelope RF carrier ( 12 ) and a second constant envelope RF carrier ( 14 ); and a second baseband signal modifier ( 8 ) arranged to receive a second baseband signal component ( 4 ) and output a third constant envelope RF carrier ( 16 ) and a fourth constant envelope RF carrier ( 18 ). The system may further comprise: a first signal combiner ( 500 ) arranged to combine the first constant envelope RF carrier ( 12 ) and the second constant envelope RF carrier ( 14 ), and arranged to output a first RF PWM signal ( 94 ); and a second signal combiner ( 502 ) arranged to combine the third constant envelope RF carrier ( 16 ) and the fourth constant envelope RF carrier ( 18 ), and arranged to output a second RF PWM signal ( 96 ).
1. A quadrature out-phasing system comprising:
a first baseband signal modifier arranged to receive a first baseband signal component and output a first constant envelope RF carrier and a second constant envelope RF carrier;
a second baseband signal modifier arranged to receive a second baseband signal component and output a third constant envelope RF carrier and a fourth constant envelope RF carrier;
a first signal combiner arranged to combine the first constant envelope RF carrier and the second constant envelope RF carrier, and arranged to output a first RF PWM signal; and
a second signal combiner arranged to combine the third constant envelope RF carrier and the fourth constant envelope RF carrier, and arranged to output a second RF PWM signal.
2. The system according to claim 1 , further comprising a local oscillator connected to the first baseband signal modifier and the second baseband signal modifier.
3. The system according to claim 1 wherein:
the first baseband signal modifier is arranged to decompose the first baseband signal component into a first decomposed baseband signal and a second decomposed baseband signal; and
the second baseband signal modifier is arranged to decompose the second baseband signal component into a third decomposed baseband signal and a fourth decomposed baseband signal.
4. The system according to claim 3 , wherein:
the first baseband signal modifier is arranged to up convert to RF frequency and then combine the first decomposed baseband signal and the second decomposed baseband signal to form the first constant envelope RF carrier and the second constant envelope RF carrier; and
the second baseband signal modifier is arranged to up convert to RF frequency and then combine the third decomposed baseband signal and the fourth decomposed baseband signal to form the third constant envelope RF carrier and the fourth constant envelope RF carrier.
5. The system according to claim 1 wherein the first constant envelope RF carrier, the second constant envelope RF carrier, the third constant envelope RF carrier and the fourth constant envelope RF carrier, are determined using the following formulae:
I 1 — RF =Re ( Ī 1 — RF )=+ A mi cos(ω c t+θ Mi )
I 2 — RF =Re ( Ī 2 — RF )=+ A mi cos(ω c t−θ Mi )
Q 1 — RF =Re ( Q 1 — RF )=− A mq sin(ω c t+θ Mq )
Q 2 — RF =Re ( Q 2 — RF )=− A mq sin(ω c t−θ Mq )
where:
I 1 — RF is the first constant envelope RF carrier;
I 2 — RF is the second constant envelope RF carrier;
Q 1 — RF is the third constant envelope RF carrier;
Q 2 — RF is the fourth constant envelope RF carrier;
A mi is an amplitude of a complex constant envelope signal I 1 (or I 2 );
A mq is an amplitude of a complex constant envelope signal Q 1 (or Q 2 );
θ Mi is a phase of a complex constant envelope signal I 2 derived from an original I component of the complex baseband signal;
θ Mq is a phase of a complex constant envelope signal Q 1 derived from an original Q component of the complex baseband signal; and
ω c is a frequency of an RF carrier signal.
6. The system according to claim 3 wherein the first decomposed baseband signal, the second decomposed baseband signal, the third decomposed baseband signal and the fourth decomposed baseband signal, are determined using the following formulae:
I
1
i
=
I
(
t
)
2
=
A
mi
cos
(
θ
Mi
)
I
1
q
=
A
mi
1
-
I
(
t
)
2
4
A
mi
2
=
A
mi
sin
(
θ
Mi
)
Q
1
i
=
A
mq
1
-
Q
(
t
)
2
4
A
mq
2
=
A
mq
sin
(
θ
Mq
)
Q
1
q
=
Q
(
t
)
2
=
A
mq
cos
(
θ
Mq
)
Where:
I 1i is the first decomposed baseband signal;
I 1q is the second decomposed baseband signal;
Q 1i is the third decomposed baseband signal;
Q 1q is the fourth decomposed baseband signal;
I(t) is the first baseband signal component;
Q(t) is the second baseband signal component;
A mi is an amplitude of a complex constant envelope signal I 1 (or I 2 );
A mq is an amplitude of a complex constant envelope signal Q 1 (or Q 2 );
θ Mi is a phase of the complex constant envelope signal I 2 derived from an original I component of a complex baseband signal; and
θ Mq is a phase of the complex constant envelope signal Q 1 derived from an original Q component of the complex baseband signal.
7. The system according to claim 1 wherein: the first signal combiner comprises:
a first limiter arranged to receive the first constant envelope RF carrier signal and output a limited first constant envelope RF carrier;
a second limiter arranged to receive the second constant envelope RF carrier signal and outputs a limited second constant envelope RF carrier; and
a first AND gate arranged to receive the limited first constant envelope RF carrier signal and the limited second constant envelope RF carrier signal, and to output the first RF PWM signal; and
the second signal combiner comprises:
a third limiter arranged to receive the third constant envelope RF carrier signal and output a limited third constant envelope RF carrier;
a fourth limiter arranged to receive the fourth constant envelope RF carrier signal and outputs a limited fourth constant envelope RF carrier; and
a second AND gate arranged to receive the limited third constant envelope RF carrier signal and the limited fourth constant envelope RF carrier signal, and to output the second RF PWM signal.
8. A method of generating a first RF PWM signal, a second RF PWM signal, a first constant envelope RF carrier, a second constant envelope RF carrier, a third constant envelope RF carrier and a fourth constant envelope RF carrier, the method comprising the steps of:
receiving a first baseband signal component and modifying the first baseband signal component to form the first constant envelope RF carrier and the second constant envelope RF carrier;
receiving a second baseband signal component and modifying the second baseband signal component to form the third constant envelope RF carrier and the fourth constant envelope RF carrier;
combining the first constant envelope RF carrier and the second constant envelope RF carrier, to output a first RF PWM signal; and
combining the third constant envelope RF carrier and the fourth constant envelope RF carrier, to output a second RF PWM signal.
9. The method according to claims 8 , further comprising the steps of:
decomposing the first baseband signal component into a first decomposed baseband signal and a second decomposed baseband signal; and
decomposing the second baseband signal component into a third decomposed baseband signal and a fourth decomposed baseband signal.
10. The method according to claim 9 , further comprising the steps of:
up converting to RF frequency and then combining the first decomposed baseband signal and the second decomposed baseband signal to form the first constant envelope RF carrier and the second constant envelope RF carrier; and
up converting to RF frequency and then combining the third decomposed baseband signal and the fourth decomposed baseband signal to form the third constant envelope RF carrier and the fourth constant envelope RF carrier.
11. The method according to claim 8 , wherein the first constant envelope RF carrier, the second constant envelope RF carrier, the third constant envelope RF carrier and the fourth constant envelope RF carrier, are determined using the following formulae:
I 1 — RF =Re ( Ī 1 — RF )=+ A mi cos(ω c t+θ Mi )
I 2 — RF =Re ( Ī 2 — RF )=+ A mi cos(ω c t−θ Mi )
Q 1 — RF =Re ( Q 1 — RF )=− A mq sin(ω c t+θ Mq )
Q 2 — RF =Re ( Q 2 — RF )=− A mq sin(ω c t−θ Mq )
where:
I 1 — RF is the first constant envelope RF carrier;
I 2 — RF is the second constant envelope RF carrier;
Q 1 — RF is the third constant envelope RF carrier;
Q 2 — RF is the fourth constant envelope RF carrier;
A mi is an amplitude of a complex constant envelope signal I 1 (or I 2 );
A mq is an amplitude of a complex constant envelope signal Q 1 (or Q 2 );
θ Mi is a phase of a complex constant envelope signal I 2 derived from an original I component of the complex baseband signal;
θ Mq is a phase of a complex constant envelope signal Q 1 derived from an original Q component of the complex baseband signal; and
ω c is a frequency of an RF carrier signal.
12. The method according to claim 9 wherein the first decomposed baseband signal, the second decomposed baseband signal, the third decomposed baseband signal and the fourth decomposed baseband signal, are determined using the following formulae:
I
1
i
=
I
(
t
)
2
=
A
mi
cos
(
θ
Mi
)
I
1
q
=
A
mi
1
-
I
(
t
)
2
4
A
mi
2
=
A
mi
sin
(
θ
Mi
)
Q
1
i
=
A
mq
1
-
Q
(
t
)
2
4
A
mq
2
=
A
mq
sin
(
θ
Mq
)
Q
1
q
=
Q
(
t
)
2
=
A
mq
cos
(
θ
Mq
)
Where:
I 1i is the first decomposed baseband signal;
I 1q is the second decomposed baseband signal;
Q 1i is the third decomposed baseband signal;
Q 1q is the fourth decomposed baseband signal;
I(t) is the first baseband signal component;
Q(t) is the second baseband signal component;
A mi is an amplitude of a complex constant envelope signal I 1 (or I 2 );
A mq is an amplitude of a complex constant envelope signal Q 1 (or Q 2 );
θ Mi is a phase of the complex constant envelope signal I 2 derived from the original I component of the complex baseband signal; and
θ Mq is a phase of the complex constant envelope signal Q 1 derived from the original Q component of the complex baseband signal.