HSP43216VC-52 Intersil, HSP43216VC-52 Datasheet - Page 14

• Manufacturer Part Number: HSP43216VC-52
• Manufacturer: Intersil

Specifications of HSP43216VC-52

• Lead Free Status / RoHS Status: Not Compliant

scaled by two to compensate for the attenuation
introduced by the interpolation process.
The Quadrature to Real Conversion mode is most easily
understood by first considering an implementation using a
7 tap transversal filter as shown in Figure 19. By examining
the combination of interpolation, filtering, and up
conversion it is seen that a particular output is only
dependent on the sum-of-products for the even indexed
samples and coefficients or the sum-of-products for the odd
indexed samples and coefficients. This computational
partitioning allows the dual interpolation filters required in
this mode to be realized using the same polyphase filter
structure used in the other modes. A functional block
diagram of the polyphase implementation for Quadrature to
Real Conversion mode is shown in Figure 20. In this
implementation, the real and imaginary components of a
complex input stream drive the even and odd tap filters.
The output of each filter is then modulated by the non-zero
mix factors and multiplexed into a single real output stream.
FIGURE 18. QUADRATURE TO REAL CONVERSION
f
’
S
= INTERPOLATED SAMPLE RATE, 2f
INPUT SIGNAL SPECTRUM
INTERPOLATED SIGNAL
UPCONVERTED SIGNAL
-f
-f
-f
-f
f
’
S
’
’
S
S
S
S
/2
/2
/2
REAL OUTPUT
= INPUT SAMPLE RATE
0
0
0
0
14
f
f
f
f
’
’
S
’
S
S
S
/2
/2
/2
FILTER PASSBAND
f
2f
f
f
’
’
’
S
S
S
S
S
HSP43216
..R1,R0
..I1,I0
..R1,R0
FIGURE 19. QUADRATURE TO REAL CONVERTER USING
..I1,I0
FIGURE 20. POLYPHASE IMPLEMENTATION OF
Y(0) = 0(0(C0)+R0(C1)+0(C2)+R1(C3)+0(C4)+R2(C5)+0(C6))+
Y(1) = 1(R0(C0)+0(C1)+R1(C2)+0(C3)+R2(C4)+0(C5)+R3(C6))+
Y(2) = 0(0(C0)+R1(C1)+0(C2)+R2(C3)+0(C4)+R3(C5)+0(C6))+
Y(3) = -1(R1(C0)+0(C1)+R2(C2)+0(C3)+R3(C4)+0(C5)+R4(C6))+
2
2
EVEN TAP FILTER
-1(0(C0)+I0(C1)+0(C2)+I1(C3)+0(C4)+I2(C5)+0(C6))
ODD TAP FILTER
C0 C2 C4 C6
1(0(C0)+I1(C1)+0(C2)+I2(C3)+0(C4)+I3(C5)+0(C6))
R
E
G
Y(0) = -1(I0(C1)+I1(C3))+I2(C5))
Y(1) = 1(R0(C0)+R1(C2)+R2(C4))+R3(C6))
Y(2) = 1(I1(C1)+I2(C3)+I3(C5))
Y(3) = -1(R1(C0)+R2(C2)+R3(C4)+R4(C6))
0(I0(C0)+0(C1)+I1(C2)+0(C3)+I2(C4)+0(C5)+I3(C6))
0(I1(C0)+0(C1)+I2(C2)+0(C3)+I3(C4)+0(C5)+I4(C6))
..R1,0,R0,0
..I1,0,I0,0
TRANSVERSAL FILTERS
QUADRATURE TO REAL CONVERTER
C1 C3 C5
C0 C1 C2 C3 C4 C5 C6
C0 C1 C2 C3 C4 C5 C6
HALFBAND FILTER
HALFBAND FILTER
-1,1,-1,1..
SIN LO
COS LO
1,-1,1,-1,..
SIN(-(
M
U
X
COS((
+
October 6, 2008
-1,0,1,0...
n
0,1,0,-1...
..,Y2,Y1,Y0
..,Y2,Y1,Y0
+1)π/2)
n
FN3365.10
+1)π/2)