Datasheet > 射频和微波 > 射频/微波混频器> AD8342-EVAL

AD8342-EVAL

更新时间： 2024-01-20 07:57:04

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	683K
描述
Active Receive Mixer LF to 500 MHz

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AD8342-EVAL 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	Reach Compliance Code：	unknown
风险等级：	5.64	Is Samacsys：	N
特性阻抗：	50 Ω	构造：	COMPONENT
最大输入功率 (CW)：	12 dBm	JESD-609代码：	e3
最大工作频率：	2400 MHz	最小工作频率：	50 MHz
最高工作温度：	85 °C	最低工作温度：	-40 °C
射频/微波设备类型：	DOUBLE BALANCED	端子面层：	MATTE TIN
Base Number Matches：	1

AD8342-EVAL 数据手册

AD8342

AC INTERFACES

The AD8342 is designed to downconvert radio frequencies (RF)

to lower intermediate frequencies (IF) using a high or low-side

local oscillator (LO). The LO is injected into the mixer core at a

frequency higher or lower than the desired input RF. The

difference between the LO and the RF , f_LO− f_RF,(high side) or

f_RF− f_LO(low side) is the intermediate frequency, f_IF. In addition

to the desired RF signal, an RF image is downconverted to the

desired IF frequency. The image frequency is at f_LO+ f_IFwhen

driven with a high side LO . When using a broadband load, the

conversion gain of the AD8342 is nearly constant over the

specified RF input band (see Figure 3).

Table 4. Dynamic Performance for Various Input Networks

Input

Network

50 Ω

Shunt

100 Ω

Shunt

500 Ω

Shunt

Matched

(Fig. 40)

Gain (dB)

IIP3 (dBm)

P1dB (dBm)

NF (dB)

0.66

25.4

10.8

3.5

22.9

8.4

5.3

20. 6

6.3

9.3

18.5

2.3

12.5

10.2

10.5

The RF port can also be matched using an LC circuit, as shown

in Figure 42.

50Ω

100nH

(1000 + j0) Ω

The AD8342 is designed to operate over a broad frequency

range. It is essential to ac-couple RF and LO ports to prevent dc

offsets from skewing the mixer core in an asymmetrical man-

ner, potentially degrading noise figure and linearity.

MAIN

= 50Ω

= 250MHz

3.6pF

1kΩ

Figure 42. Matching Circuit

The RF input of the AD8342 is high impedance, 1 kΩ across the

frequency range shown in Figure 41. The input capacitance

decreases with frequency due to package parasitics.

Impedance transformations of greater than 10:1 result in a

higher Q circuit and thus a narrow RF input bandwidth. A 1 kΩ

resistor is placed across the RF input of the device in parallel

with the device internal input impedance, creating a 500 Ω load.

This impedance is matched to as close as possible to 50 Ω for

the source, with standard components using a shunt C, series L

matching circuit (see Figure 43).

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

1.00

0.75

0.50

0.25

50.0

25.0

100.0

Q = 3.0

200.0

10.0

500.0

100M 200M 300M 400M 500M 600M 700M 800M 900M 1G

FREQUENCY (Hz)

Figure 41. RF Input Impedance

500.0

200.0

100.0

The matching or termination used at the RF input of the

AD8342 has a direct effect on its dynamic range. The charac-

terization circuit, as well as the evaluation board, uses a 100 Ω

resistor to terminate the RF port. This termination resistor in

shunt with the input stage results in a return loss of better than

−10 dBm (relative to 50 Ω). Table 4 shows gain, IP3, P1dB, and

noise figure for four different input networks. This data was

measured at an RF frequency of 250 MHz and at an LO

frequency of 300 MHz.

50.0

25.0

10.0

Point 1(1000.0 + j0.0)Ω Q = 0.0 at 250.000 MHz

Point 2(500.0 + j0.0)Ω Q = 0.0 at 250.000 MHz

Point 3(55.6 − j157.2)Ω Q = 2.8 at 250.000 MHz

Point 4(55.6 − j0.1)Ω Q = 0.0 at 250.000 MHz

Figure 43. LC Matching Example

Rev. 0 | Page 15 of 20

1...12 13 141516 17 18...20

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与AD8342-EVAL相关器件

型号	品牌	获取价格	描述	数据表
AD8343	ADI	获取价格	DC-to-2.5 GHz High IP3 Active Mixer
AD8343(14SOIC)	ETC	获取价格	Analog IC
AD8343(14TSSOP)	ETC	获取价格	Analog IC
AD8343ARU	ADI	获取价格	DC-to-2.5 GHz High IP3 Active Mixer
AD8343ARU	ROCHESTER	获取价格	0 MHz - 2500 MHz RF/MICROWAVE DOUBLE BALANCED MIXER, PLASTIC, TSSOP-14
AD8343ARU-REEL	ADI	获取价格	DC-to-2.5 GHz High IP3 Active Mixer
AD8343ARU-REEL	ROCHESTER	获取价格	0 MHz - 2500 MHz RF/MICROWAVE DOUBLE BALANCED MIXER, PLASTIC, TSSOP-14
AD8343ARU-REEL7	ADI	获取价格	DC-to-2.5 GHz High IP3 Active Mixer
AD8343ARU-REEL7	ROCHESTER	获取价格	0 MHz - 2500 MHz RF/MICROWAVE DOUBLE BALANCED MIXER, PLASTIC, TSSOP-14
AD8343ARUZ	ADI	获取价格	DC-to-2.5 GHz High IP3 Active Mixer

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