User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document History
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- List of parts and accessories
MC46 Hardware Interface Description
Confidential / Released
s
mo b i l e
MC46_HD_V03.05 Page 77 of 99 13.11.2003
5.4.1 Current consumption during transmit burst
A Smith chart shows the complex impedance plane. The Smith chart in Figure 36 illustrates the
dependence between the typical peak current consumption of the application during a transmit
burst and an impedance connected to the antenna reference point (ARP).
As shown in Figure 36, the typical current consumption is about 2000 mA, but the current is
maximized when the minimum supply voltage is used together with a total reflection at the
RF interface.
The Smith chart in Figure 36 shows the current consumption at the following conditions:
· Channel with the highest current consumption: 836.4 MHz (Channel 189)
· T
amb
= 25°C
· Maximum peak current = 3.0A
· Minimum supply voltage during burst = 3.35V
This measurement case was performed with a total resistance of about 100m" in the current
path.
Figure 36: Peak current during transmit burst in mA vs. antenna impedance
Positive reactive resistance
Effective resistance
Negative reactive resistance
0
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