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参数资料
| 型号： | WE905 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx单芯片FM收发器 |
| 文件页数： | 14/39页 |
| 文件大小： | 623K |
| 代理商： | WE905 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 21
Rev Date: 2003 May 27
FM MODULATION
FM DEVIATION
The transmitter utilizes direct modulation method where the modulation signal is directly applied to the
PLL loop filter.
FM deviation is depending on the a.c. voltage level of the applied modulation signal as well as TVCO
gain. TVCO gain is in term, dependent on the TVCO frequency and TPLL voltage. It is normally
desirable for FM deviation to be consistent for a given modulating voltage level.
For a circuit that is designed to operate at a Tx frequency band, the TVCO frequency is fixed by
Transmit Frequency Register.
However, the locked TPLL voltage may differ from one unit to another. This is mainly due to the
tolerance of external TVCO inductors and the choice of Tx trim bit which set the internal capacitance.
The solution is either to use tight tolerance TVCO inductors or a potential divider to adjust the voltage
level of the modulating signal.
Using tight tolerance inductors, such as PCB printed inductors, FM deviation varies between board to
board can be maintained within +/-20%. For more accurate FM deviation, a pot meter is required to
adjust the modulating signal level.
FM MODULATOR
If there is a change in PLL loop filter, the Tx modulator components have to be changed to get the
desired frequency response and Tx FM deviation.
Values for modulator components can be determined by simulation. How VCO frequency responses
to an input to the modulator circuit (ac or transient) are simulated to obtain the correct modulator RC
combination. Below is the circuit for modulator simulation.
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