Datasheet > HMC8108LC5TR-R5

HMC8108LC5TR-R5

更新时间： 2024-02-21 17:37:56

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
18页	430K
描述
9 GHz to 10 GHz, X-Band, GaAs, MMIC, Low Noise Converter

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HMC8108LC5TR-R5 数据手册

Data Sheet

HMC8108

APPLICATIONS INFORMATION

A typical lower sideband application circuit is shown in Figure 57.

The IF_Q output signal of the HMC8108 is connected to the

90° port of the hybrid coupler followed by a low-pass filter to

produce a lower sideband IF output signal. The LO input signal

passes through a voltage control oscillator (VCO) followed by

an optional buffer amplifier, a 2× frequency multiplier, and an

optional band-pass filter before entering the LO port of the

device. Band-pass filter and LO buffer are optional and depend

on the VCO specification and the LO input power requirement.

External capacitors of 0.6 pF, 1 nF, 10 nF, and 100 nF, and 5.6 nH

inductors are connected to the input voltage pin of the device.

The IF_I and IF_Q pins are dc-coupled and must not source or

sink more than 3 mA of current or device malfunction or possible

device failure may result. For applications not requiring

operation to dc, use an off chip dc blocking capacitor.

To turn off the HMC8108, take the following steps:

1. Turn off the LO and RF signal source.

2. Turn off the LNA_VD1, LNA_VD2, and BUFF_VD power

supplies.

3. Turn off the LNA_VG1, LNA_VG2, BUFF_VG, MIX_VG,

and VCTRL power supplies. Refer to Figure 55 for the

HMC8108 lab bench setup.

RF INPUT

POWER

SUPPLY

POWER

SUPPLY

BIASING SEQUENCE

90° HYBRID FOR

I/Q IF OUTPUT

90°

0°

The HMC8108 uses amplifier and LO buffer stages. These active

stages use depletion mode, pseudomorphic high electron

mobility transfer (pHEMT) transistors.

To avoid transistor damage, follow these power-up bias

sequence steps:

POWER

SUPPLY

1. Set the LNA_VG1, LNA_VG2, and BUFF_VG power

supplies to −2 V and the MIX_VG power supply to +1.4 V.

Do not turn on the power supplies.

LO INPUT

SPECTRUM

ANALYZER

Figure 55. HMC8108 Lab Bench Setup

2. Set the LNA_VD1, LNA_VD2, and BUFF_VD power

supplies to 3 V. Do not turn on the power supplies.

3. Set the VCTRL power supply to −1 V. Do not turn on the

power supply.

4. Turn on the power supplies in Step 1, Step 2, and Step 3 in

order.

5. Adjust the LNA_VG1, LNA_VG2, and BUFF_VG power

supplies between −2 V and 0 V to achieve an quiescent

current LNA_ID1, LNA_ID2, and BUFF_ID = 20 mA,

30 mA, and 40 mA, respectively.

6. Connect the signal generator to the RF and LO input.

7. Connect the 90° hybrid to the IF_I and IF_Q output. Note

that IF_Q is connected to the 90° port of the hybrid. Under

this condition, the lower sideband is selected.

8. Turn on the LO and RF input to see the output on the

spectrum analyzer.

RESULTS

Figure 56 shows the expected results when testing the HMC8108

with the following operating conditions:



RF = −15 dBm at 9.44 GHz

LO = −5 dBm at 9.5 GHz

The on board IF_Q port is connected to the 90° port of the

hybrid.



The lower sideband is selected.

Note that hybrid, cable, and board loss were not deembedded.

RWB 6.25kHz

VBW 20kHz

SWT 420ms

MARKER 1 [T1]

–4.31dBm

REF 0dBm

ATT 5dB

60.00MHz

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

CENTER 59.511MHz

1.63MHz/

SPAN 16.3MHz

Figure 56. Test Results at IF = 60 MHz

Rev. 0 | Page 15 of 18

1...12 13 141516 17 18

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HMC8108LC5TR-R5 替代型号

型号	品牌	替代类型	描述	数据表
HMC8108LC5	ADI	完全替代	9 GHz to 10 GHz, X-Band, GaAs, MMIC, Low Noise Converter
HMC8108LC5TR	ADI	完全替代	9 GHz to 10 GHz, X-Band, GaAs, MMIC, Low Noise Converter

与HMC8108LC5TR-R5相关器件

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