參數(shù)資料
型號： HSP50016JC-52
廠商： INTERSIL CORP
元件分類： 數(shù)字信號處理外設(shè)
英文描述： Digital Down Converter
中文描述： 16-BIT, DSP-MIXER, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 24/31頁
文件大?。?/td> 209K
代理商： HSP50016JC-52
3-221
Up Conversion by f”/2
This operation allows the user to exchange the positions of
the upper and lower halves of a down converted signal
while leaving each half unchanged. Quadrature up
conversion by f”/2 is performed by multiplying the output
signal by e
j2
π
nf’’/2
= cos(2pnf”/2) + j sin(2pnf”/2). When
sampled at a rate of f”, cos(2pnf”/2) takes on the values 1,
-1, 1, -1,... and sin(2pnf”/2) always = 0. Thus, the up
convert LO sequence is:
This sequence is multiplied by the output of the I and Q
branches of the filter:
w(n) = cos((
ω
k
-
ω
c
)n) + jsin((
ω
k
-
ω
c
)n)
= e
j(
ω
k
-
ω
c
)n
,
yielding an output sequence:
The Formatter contains the circuitry to shift the quadrature
output spectrum up by one half of the output sample
frequency f”. This operation is independent of the function of
the Phase Generator and Mixer. The spectra of the outputs
of the Filter and Formatter are shown in Figure 18.
The setup is identical to the down conversion configuration,
except that the Up Convert Bit is set in Control Word 4.
0
f”/4
f”/2
-f”/4
-f”/2
0
f”/4
f’
8
f
S
8R
f”/2
f’
4
f
S
4R
-f”/4
-f’
8
-f
S
8R
-f”/2
-f’
4
-f
S
4R
0
f”/4
f”/2
-f”/4
-f”/2
B. FIRST OPERATION IN FORMATTER:
UP CONVERT BY SAMPLE FREQUENCY / 4
A. OUTPUT OF FIR FILTERS: SIGNAL OVERSAMPLED BY 2
C. SECOND OPERATION IN FORMATTER: I OUTPUT = I + Q
FIGURE 17. QUADRATURE TO REAL CONVERSION OF AN OUTPUT SIGNAL
-f’
4
-f
S
4R
-f’
8
-f
S
8R
f’
8
f
S
8R
f’
4
f
S
4R
-f’
4
-f
S
4R
-f’
8
-f
S
8R
f’
8
f
S
8R
f’
4
f
S
4R
f
S
= f
1
’R
f
1
’ = 2f”
e
j
π
n
= 1 + j0, -1 + j0, 1 + j0, …
(EQ. 24)
(EQ. 25)
y = (RE(w(n)), IM(w(n))),
(EQ. 26)
-RE(w(n+1)), - IM(w(n+1))),
RE(w(n+2)), IM(w(n+2))), …
0
f”/4
f”/2
-f”/4
-f”/2
0 f”/4
f”/2
-f”/4
-f”/2
B. FILTER OUTPUT UP CONVERTED BY
OUTPUT SAMPLE FREQUENCY / 2
A. OUTPUT OF FIR FILTERS
FIGURE 18. UP CONVERSION BY F” / 2
HSP50016
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