ZTE Corporation ZTEMF206A Manual De Usuario

MF206A

In poor situation of the network, the antenna will transmit at the maximum power, and the transient maximum

peak current can reach as high as 2A. So the power supply capacity of system board needs to be above 2.5A to

satisfy the requirement of module peak current; and the average current on the system side needs to be above

2.0A. Meanwhile, consider the voltage drop of power supply on the side of main board. If the network is in a

poor situation or under 2G, the module peak current will be great, Therefore the power supply has to be designed

in order to withstand with these current peaks without big voltage drops; this means that both the electrical

design and the board layout must be designed for this current flow. If the layout of the PCB is not well designed

a strong noise floor is generated on the ground and the supply; and exceptions such as restart of the module may

occur.

The peak current of ZTEWelink module under the GSM BURST mode is different due to the differences in

actual network environments. And its transient current under different powers will be various as well. The

greater the power is, the greater the transient current is. The network quality also directly affects the work

current of the module. If the network is in well situation, the peak work current on the module will be small. But

if the network is in poor situation, its peak current will be great as shown in Figure 4-1. When ZTEWelink

module works under the EDGE/GPRS Time Slot (2-high 6-low) and CLASS 10, if the module works under the

2-high work Time Slot, it requires greater current, and the voltage drop will occur accordingly.

Figure 4–1 Power Supply Current and Voltage Change under EDGE/GPRS

t/ms

Unit: 200mA/cell

Unit: V/cell

Voltage

Current

EDGE/GPRS TS

2-high 6-low

CLASS10

3.462ms

1.154ms

(577us/cell)

200mA

3.6V

4.3

Circuit Requirements of Power Supply Output

Requirement：