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參數(shù)資料
| 型號(hào)： | TZA1047HL/M2 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.4 MM HEIGHT, PLASTIC, MS-026, SOT314-2, LQFP-64 |
| 文件頁(yè)數(shù)： | 35/69頁(yè) |
| 文件大小： | 324K |
| 代理商： | TZA1047HL/M2 |
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9397 750 14664
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 02 — 1 June 2005
40 of 69
Philips Semiconductors
TZA1047
Preprocessor IC for CD and DVD rewritable
7.13 BETA
The BETA block delivers signals that are used in the write power calibration procedure at
disc start-up. A detailed block diagram of the BETA block is shown in Figure 22.
The BETA circuit uses the input signal rf-beta from the RF Amplier to produce the RF
average level output signal CALF and the RF top and bottom peak level output signals A1
and A2. The relationship between the various BETA block signals are given by equation
Equation 7, Equation 8 and Equation 9, where rf = rf-beta1 = rf-beta2.
(7)
(8)
(9)
The DC gain (in read mode) between signals (RFP to RFN) and signals A1, A2 and CALF
is given by:
The gain can be controlled by parameter IBS. The typical value of VBETA is 2.5 V and
value IBS =5 × (1 + IBS) A. Furthermore RRF = 2.5 k, resulting in GBETA = 100/(1 + IBS).
Both the peak detector time constant and the CALF low-pass lter can be adjusted to the
disk speed by parameter BCTL[2:0]. The seven different time constant settings for the
low-pass lter allow its frequency range fLPF to be set from 500 Hz to 32 kHz.
To save power, the BETA block and its DAC can be switched off completely by setting
parameter BCTL[2:0] to 111. If the BETA block and its DAC are switched off, the
3dB
frequency and time constant will not be dened.
Fig 22. BETA block.
VBETA
rf-beta2
rf-beta1
mgw493
PEAK
DETECTOR
BCTL
IBS
CA1
+
A1
VBETA
LPF
BCTL
CCALF
CALF
VBETA
PEAK
DETECTOR
BCTL
CA2
+
A2
CALF
LPF rf
()
I
BS
--------------------
V
BETA
×
=
A1
rf
LPF rf
()
–
[]
peak
I
BS
------------------------------------------------
V
BETA
×
=
A2
LPF rf
()
rf
–
()
[]
peak
I
BS
----------------------------------------------------
V
BETA
×
=
G
BETA
V
BETA
I
BS
R
rf
2
×
-------------------------------
G
RFR
×
=
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