參數(shù)資料
型號(hào)： ZL20250
廠商： Zarlink Semiconductor Inc.
英文描述： 2.5G Multimode Transceiver
中文描述： 2.5G的多模收發(fā)器
文件頁數(shù)： 19/56頁
文件大小： 392K
代理商： ZL20250
ZL20250
Data Sheet
19
Zarlink Semiconductor Inc.
Figure 8 - External Transmit IF Filter
1.3 UHF LO and Frequency Doubler
Figure 8 also shows the UHF LO buffering and frequency doubler. The ZL20250 is designed to operate either with
separate external UHF VCOs for the 900 and 1900 MHz frequency bands, or alternatively a single 900 MHz VCO
can be used with the on-chip frequency doubler providing the LO for the 1900 MHz band. A UHF synthesizer is
included. The input to the UHF synthesizer will normally be the active UHF LO signal, however when using the
frequency doubler mode for 1900 MHz LO generation, the synthesizer input can be selected to be either the
frequency doubler output or the 900 MHz input LO signal. The UHF LO input buffer minimizes any load pulling effects
on the UHF VCO when internal modes are switched.
UHF LO output buffers are also provided. These can be used to drive an external mixer for the receive section. If not
required these buffers can be powered down.
1.4 UHF Frequency Synthesizer
A fractional N UHF synthesizer is included on the ZL20250 to provide LO signals for the transmit up-converter and
the external receive RF down-converters. The UHF synthesizer operates with an external VCO. A block diagram of
the synthesizer is shown in Figure 9.
.
Figure 9 - UHF Synthesizer
Reference Counter
14 bit
Quad Modulus
Prescaler
64/65/72/73
M Counter
13 bit
B
3 bit
A
4 bit
Fractional N
Counter
Fractional N
Scaling DAC
Fractional N
Compensation DAC
Phase
Detector
Charge
Pump
Lock Detect
TCXO
UHF LO
Frac N
Compensation
8 bits
UHF
CP
+1
+8
+1
5 bits
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