HMC8142 Ver la hoja de datos (PDF) - Analog Devices

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Fabricante

HMC8142

81 GHz to 86 GHz, E-Band Power Amplifier With Power Detector

Analog Devices 

Data Sheet

APPLICATIONS INFORMATION

TYPICAL APPLICATION CIRCUIT

A typical application circuit for the HMC8142 is shown in

Figure 40. Combine supply lines as shown in the application

circuit schematic to minimize external component count and

simplify power supply routing.

The HMC8142 uses several amplifier, detector, and attenuator

stages. All stages use depletion mode pHEMT transistors. It is

important to follow the following power-up bias sequence to

ensure transistor damage does not occur.

VDD1, VDD2, VDD3, VDD4

4.7µF

0.01µF

HMC8142

1. Apply a −2 V bias to the VGG1 to VGG4 pads.

2. Apply 4 V to the VDD1 to VDD4 pads.

3. Adjust VGG1 to VGG4 between −2 V and 0 V to achieve a

total amplifier drain current of 450 mA.

To power down the HMC8142, follow the procedure in reverse.

For additional guidance on general bias sequencing, see the

MMIC Amplifier Biasing Procedure application note.

RFIN

VGG1, VGG2, VGG3, VGG4

120pF

120pF

120pF

120pF

45 67

89

VDD1

VDD2

VDD3

10 11

VDD4

3

2

RFIN

1

12

RFOUT 13

14

VGG1

VGG2

VGG3

VGG4

25 24 23 22

21 20 19 18

VREF VDET

17 16 15

RFOUT

120pF

4.7µF

120pF

120pF 120pF

0.01µF

Figure 40. Typical Application Circuit

+5V

+5V

100kΩ 100kΩ 10kΩ

10kΩ

10kΩ

VOUT = VREF – VDET

10kΩ

–5V

SUGGESTED INTERFACE CIRCUIT

Rev. A | Page 13 of 16

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