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參數資料
| 型號： | TZA1031HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM, PLASTIC, MS-026, SOT-314-2, LQFP-64 |
| 文件頁數： | 16/52頁 |
| 文件大小： | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
23
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.3
RF-AMP
7.3.1
DATA PATH AMPLIFIER AND FILTERING
handbook, full pagewidth
MGW489
I/V
V/I
+
+
EQ
RFP
RFN
BWRF
ORF
GRF
DCRF
DC-CONTROL
OFFSET
CONTROL
RFP1
RFN1
RFP2
RFN2
RF1/2
RFREF
bca-rfp
ZCAL
0
Vref
rf-cal
rfb
rfa
VGA
NF
BWRF
ENEQ
KEQ
ENNF
HA
Rrf
Rcal
bca-rfn
rf-beta2
rf-beta1
rf-alfa
rf-norm
Fig.13 RF-AMP circuit.
The source signal for the RF-AMP is either the differential
voltage pair (RFP1 and RFN1) or (RFP2 and RFN2). The
selection is done via the serial bus with bit RF1/2 (see
Fig.13). A DC-control function is included to allow the
output signal to be DC-coupled to a channel decoder. The
relation between input and output of the DC-control block
is given by rfb =rfa DCRF. The RF-AMP has a Variable
Gain Amplifier (VGA) that is controlled via the serial bus.
The output of the VGA is sent to a filter section that
consists of an Equalizer (EQ) and a Noise Filter (NF),
which are controlled by KEQ, ENEQ, BWRF and ENNF.
The equalizer has a transfer function H1(s) which is
modelled after a target transfer function He(s):
(3)
This represents a 3rd-degree equi-ripple phase filter with a
good delay response. The boost factor k is programmable
via the serial interface with control bit KEQ.
The corner frequency
ω0(RF) =2π× f0(RF) is programmable
via control parameter BWRF. The equalizer is switched on
with bit ENEQ.
The noise filter has a transfer function H2(s) which is
modelled after a 3rd-order Butterworth low-pass filter with
target transfer function Hn(s):
(4)
The corner frequency
ω
0(RF) is equal to that of the
equalizer filter.
Finally the low-ohmic differential output voltage is
produced by a driver stage, where input voltage RFREF
defines the common mode voltage of RFP and RFN.
Bit HA selects between a low output level (HA = 0) and a
high output level (HA = 1).
H
e s
()
1k
–
s
2
ω
0(RF)
2
------------------
×
1
s
2
ω
0(RF)
2
------------------
α
s
ω
0(RF)
---------------
×
++
-------------------------------------------------------------
1
τ
s
ω
0(RF)
---------------
×
+
----------------------------------
×
=
H
n s
()
1
s
2
ω
0(RF)
2
------------------
s
ω
0(RF)
---------------
++
---------------------------------------------------
1
s
ω
0(RF)
----------------
+
--------------------------
×
=
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