-
公开(公告)号：US20230327681A1
公开(公告)日：2023-10-12
申请号：US18131835
申请日：2023-04-06
IPC分类号： H03M3/00
摘要： A digital delta-sigma modulator (DDSM) is disclosed with an input signal x[n], an output signal y[n], a quantization error signal e[n] and a dither signal d[n], having an equation described in the z-domain by
Y(z)=STF(z)X(z)+DTF(z)D(z)−NTF(z)E(z)
wherein Y(z), X(z), D(z) and E(z) are z-transforms of the output signal, the input signal, the dither signal, and the quantization error signal, and wherein STF(z), DTF(z) and NTF(z) correspond to a transfer function of the input signal, a transfer function of the dither signal, and a transfer function of the quantization error signal, and wherein the transfer function of the quantization error signal is of the form:
NTF
(
z
)
=
Az
-
Q
(
1
+
∑
i
=
1
K
c
i
z
-
i
)
where A, Q and K are constants, coefficients ci are real valued and cK≠0 and wherein at least one of the zeroes zj of
(
1
+
∑
i
=
1
K
c
i
z
-
i
)
satisfies zj≠+1 for j=1, 2, . . . , K-
2.发明公开公开(公告)号：US20230198547A1
公开(公告)日：2023-06-22
申请号：US18085066
申请日：2022-12-20
CPC分类号： H03M7/3008 , H03M7/3026
摘要： An apparatus for mitigating nonlinearity-induced spurs and noise in a fractional-N frequency synthesizer
A digital delta-sigma modulator (DDSM) is disclosed with an input signal x[n], an output signal y[n], a quantization error signal e[n] and a dither signal d[n], having an equation described in the z-domain by
Y(z)=STF(z)X(z)+DTF(z)D(z)−NTF(z)E(z)
wherein Y(z), X(z), D(z) andE(z) are z-transforms of the output signal, the input signal, the dither signal, and the quantization error signal, and wherein STF (z), DTF(z) and NTF(z) correspond to a transfer function of the input signal, a transfer function of the dither signal, and a transfer function of the quantization error signal, and wherein the transfer function of the quantization error signal is of the form:
NTF
(
z
)
=
Az
-
Q
(
1
-
z
-
1
)
(
1
+
∑
i
=
1
K
c
i
z
-
i
)
where A , Q and K are constants, coefficients ci are real valued and cK≠0 and wherein at least one of the zeroes zj of
(
1
+
∑
i
=
1
K
c
i
z
-
i
)
satisfies zj≠+1 for j=1, 2, . . . , K
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