ADF4110BCP

更新时间： 2024-02-09 19:22:42

品牌	Logo	应用领域
亚德诺 - ADI		射频
页数	文件大小	规格书
24页	263K
描述
RF PLL Frequency Synthesizers

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ADF4110BCP 数据手册

ADF4110/ADF4111/ADF4112/ADF4113

DIRECT CONVERSION MODULATOR

The target application is a WCDMA base station transmitter.

Typical phase noise performance from this LO is –85 dBc/Hz at

a 1 kHz offset.

In some applications a direct conversion architecture can be used

in base station transmitters. Figure 33 shows the combination

available from ADI to implement this solution.

The LO port of the AD8346 is driven in single-ended fashion.

LOIN is ac-coupled to ground with the 100 pF capacitor and

LOIP is driven through the ac coupling capacitor from a 50 Ω

source. An LO drive level of between –6 dBm and –12 dBm is

required. The circuit of Figure 33 gives a typical level of –8 dBm.

The circuit diagram shows the AD9761 being used with the

AD8346. The use of dual integrated DACs such as the AD9761

with specified 0.02 dB and 0.004 dB gain and offset match-

ing characteristics ensures minimum error contribution (over

temperature) from this portion of the signal chain.

The RF output is designed to drive a 50 Ω load but must be

ac-coupled as shown in Figure 33. If the I and Q inputs are

driven in quadrature by 2 V p-p signals, the resulting output

power will be around –10 dBm.

The Local Oscillator (LO) is implemented using the ADF4113.

In this case, the OSC 3B1-13M0 provides the stable 13 MHz

reference frequency. The system is designed for a 200 kHz

channel spacing and an output center frequency of 1960 MHz.

REFIO

IOUTA

IBBP

IBBN

100pF

LOW-PASS

FILTER

OUT

VOUT

IOUTB

MODULATED

DIGITAL

DATA

AD9761

TxDAC

AD8346

QOUTA

QOUTB

QBBP

QBBN

LOW-PASS

FILTER

FS ADJ

2k⍀

LOIN

LOIP

100pF

4.7k⍀

100pF

OSC 3B1-13M0

TCXO

18⍀

SET

100pF

18⍀

3.3k⍀

REF

3.9k⍀

VCO190-1960T

910pF

ADF4113

620pF

SERIAL

DIGITAL

NTERFACE

9.1nF

18⍀

RF A

100pF

51⍀

POWER SUPPLY CONNECTIONS AND DECOUPLING

CAPACITORS ARE OMITTED FROM DIAGRAM FOR CLARITY.

Figure 33. Direct Conversion Transmitter Solution

–22–

REV. 0

1...19 20 212223 24

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