Overview
The HMC981LP3E is an active bias controller manufactured by Analog Devices. It is designed to automatically adjust the gate voltage of external amplifiers to achieve a constant bias current. This device is suitable for biasing both enhancement and depletion type amplifiers operating in the Class-A regime, with drain voltages ranging from 4V to 12V and drain currents up to 200mA. The HMC981LP3E ensures excellent bias stability over supply, temperature, and process variations, eliminating the need for calibration procedures that are typically required to prevent RF performance degradation.
Key Specifications
| Parameter | Min. | Typ. | Max. | Conditions |
|---|---|---|---|---|
| Supply Voltage (VDD) | 4V | - | 12V | - |
| Digital Voltage (VDIG) | 3.3V | - | 5V | - |
| Drain Current | - | - | 200mA | - |
| Gate Current Capability | - | ±0.8 mA | - | - |
| Internal Switch Resistance (RDS_ON) | 10 Ohm | - | 5 Ohm | SW=GND, SW=VDIG |
| Quiescent Current (IDIG) | - | 3 mA | - | VDIG=3.3V |
| Package Type | - | - | 16-Lead QFN (3mm x 3mm w/ EP) | - |
Key Features
- Automatic gate voltage adjustment without the need for calibration.
- Supports both enhancement and depletion type amplifiers.
- Adjustable drain current up to 200mA.
- Sink and source gate current capability (±0.8 mA).
- Optional internal negative voltage generation that can be disabled to use an external negative rail.
- Power-up and power-down sequencing to protect the external amplifier.
- Short circuit protection feature.
- Housed in an RoHS compliant 3x3 mm QFN leadless package with an exposed backside pad for improved thermal characteristics.
Applications
- Microwave Radio & VSAT
- Military & Space
- Test Instrumentation
- Fiber Optic Modulator Driver Biasing
- CATV Laser Driver Biasing
- Cellular Base Station
- Wireless Infrastructure Equipment
Q & A
- What is the primary function of the HMC981LP3E?
The HMC981LP3E is an active bias controller that automatically adjusts the gate voltage of an external amplifier to achieve a constant bias current.
- What types of amplifiers can the HMC981LP3E bias?
The HMC981LP3E can bias both enhancement and depletion type amplifiers operating in the Class-A regime.
- What is the range of supply voltage for the HMC981LP3E?
The supply voltage range for the HMC981LP3E is from 4V to 12V.
- What is the maximum drain current the HMC981LP3E can handle?
The HMC981LP3E can handle drain currents up to 200mA.
- Does the HMC981LP3E require calibration?
No, the HMC981LP3E does not require calibration due to its automatic gate voltage adjustment feature.
- What package type is the HMC981LP3E available in?
The HMC981LP3E is housed in a 16-Lead QFN (3mm x 3mm w/ EP) package.
- What are the typical applications of the HMC981LP3E?
The HMC981LP3E is used in applications such as Microwave Radio & VSAT, Military & Space, Test Instrumentation, Fiber Optic Modulator Driver Biasing, CATV Laser Driver Biasing, Cellular Base Station, and Wireless Infrastructure Equipment.
- Does the HMC981LP3E have built-in protection features?
- How does the HMC981LP3E handle power-up and power-down sequencing?
The HMC981LP3E ensures safe power-up and power-down sequencing of the targeted amplifier by adjusting the sequence of VDRAIN, VGATE, and VG2 outputs.
- Can the HMC981LP3E generate negative voltages internally?
