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| 型號(hào)： | PCF5079 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Dual-band power amplifier controller for GSM, PCN and DCS |
| 中文描述： | 雙頻功率的GSM，PCN和DCS放大器控制器 |
| 文件頁(yè)數(shù)： | 16/28頁(yè) |
| 文件大小： | 146K |
| 代理商： | PCF5079 |
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2001 Nov 21
16
Philips Semiconductors
Product specification
Dual-band power amplifier controller for
GSM, PCN and DCS
PCF5079
handbook, full pagewidth
R2
1 k
R1
1 k
MGT337
PCF5079
1
2
3
4
5
10
9
8
7
6
VCG
CINT1
<
50 pF
CINT2
<
50 pF
RF SECTION
AUXDAC3
PCF5073x
VINT(N)
VCD
VS1
VS2
VSS
VDAC
0 to 2.3 V
PU
BS
VDD
Fig.13 Diagram showing external components required.
12.1
Ramp control
CODE
KICK
and V
home
define the starting conditions for
ramping-up. Ramping-up and ramping-down are defined
by V
VDAC
. CODE
END
and CODE
START
define the correct
shut-off of the power module.
The non-linear behaviour of the control curves of the
power modules has a large influence on the loop. Starting
conditions in the flat area of the control curve are critical
and need some attention. Initially the voltage on
pins VCD (VCG) will be at the home position.
Successively, the integrator is moved into the active part
of the control curve.
This is achieved by integrating CODE
KICK
. When
VCD (VCG) voltage has reached the active region of the
control curve, the loop is closed and the circuit can follow
the ramping function generated at pin VDAC. The top
value of VDAC voltage determines the power of the
transmit burst. Ramping-down is started according to the
decrease of VDAC voltage. The loop follows the leading
function for ramping-down until the RF sensor leaves its
active region. The reason for CODE
START
and CODE
END
is to shorten the tail of the slope.
MGT338
handbook, halfpage
RL
IL
350
120 pF
Fig.14 Worst case load on control voltage pins
VCG and VCD.
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