參數(shù)資料
型號(hào)： 935185240518
廠商： NXP SEMICONDUCTORS
元件分類： 通信及網(wǎng)絡(luò)
英文描述： SPECIALTY TELECOM CIRCUIT, PDSO20
封裝： PLASTIC, SOT-266, SSOP-20
文件頁(yè)數(shù)： 13/30頁(yè)
文件大?。?/td> 251K
代理商： 935185240518
1997 Feb 27
20
Philips Semiconductors
Product specication
Power amplier controller for GSM and
PCN systems
PCF5075
12 APPENDIX A: BASE STATION FEATURES
In base station applications a so called ‘quick restart’ is
used and performs the following. When a quick restart
condition is detected, which means TRIG goes LOW for a
period of less than two clock periods, the integrating
controller is not totally turned off. This enables the
controller to ramp-up faster after a ramp-down
(see Fig.11). It should be noted that at time ‘E’ the voltage
at the positive input of OP4 is now 100 mV higher than
without quick restart, which causes the slower and less
steep ramp-down. A normal ramp-up will restart after 38
clock periods. Burst 1 and Burst 2 can have different
power levels if the PL register is reprogrammed between
time ‘E’ and ‘G’.
handbook, full pagewidth
AS
BS
CS
DS
ES
FS
GS
HS
4
1
6
30
70
22Tcy
18Tcy
t1
t2
2Tcy
18Tcy
38Tcy
TRIG
PD
KICKA
HPA
QRSA
DACA
VINT(p)
(OP4)
(1)
(2)
(3)
(4)
BC
E
G
BURST 2
BURST 1
dB
MBE724
Fig.11 Base station features timing diagram.
(1) VSR 2Vd1 +VKICK (start integrator).
(2) VSR 2Vd1 +VPL
(3) VSR 2Vd1
(4) VSR 2Vd1 +VPL
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