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参数资料
| 型号： | FX980L6 |
| 厂商： | CML MICROSYSTEMS PLC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC44 |
| 封装： | PLASTIC, LCC-44 |
| 文件页数： | 55/86页 |
| 文件大小： | 821K |
| 代理商： | FX980L6 |
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TETRA Baseband Processor
FX980
1997 Consumer Microcircuits Limited
59
D/980/3
TxPhase
Title:
Transmit I and Q channel Phase correction register
Address:
$0x40, $0x41, $0x46, $0x47 (4 locations)
Function:
RW
Description:
This register controls the Tx Data path I and Q channel phase compensation. The phase may
be adjusted by
±7.1° with respect to the input data signal phase. As each channel has separate
phase adjustments the maximum differential phase compensation that can be achieved is
±14.2°. The phase adjustment value written to this register is a 2s-complement value (N
phase).
The amount of phase adjustment applied is given by the formula:
φ
tan
N
2
- 1
phase
11
=
Where:
φ
N
phase
is the phase adjustment,
is the value in the register and has
a range of -256 to +255.
Note: Although each channel is separately adjustable with its own compensation value, the
effect of phase adjustment is only detectable by measuring the phase angle between I and Q
channels. It should be noted that the N
phase
value has the effect of lagging the I channel for
positive values of N
phase (conversely, leading the phase for negative values) and leading the Q
channel for positive values of N
phase
(conversely, lagging the phase for negative values). For
example, putting the value 10 (decimal) into both TxIPhase and TxQPhase would produce a
differential phase on I and Q of:
90
o - 2(tan-1(4.88x10-3)) = 89.44o
Bit
Name
Active State
Function
Address $0x40
7:0
TxIPhaseLSB
Data RW
Least significant 8 bits of the TxIPhase register (N
phase).
Address $0x41
7:1
RW
Reserved. Set these bits Low. Undefined on read.
0
TxIPhaseMSB
Data RW
Most significant bit of the TxIPhase register (sign bit).
Address $0x46
7:0
TxQPhaseLSB
Data RW
Least significant 8 bits of the TxQPhase register (N
phase).
Address $0x47
7:1
RW
Reserved. Set these bits Low. Undefined on read.
0
TxQPhaseMSB
Data RW
Most significant bit of the TxQPhase register (sign bit).
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