Overview
The HMC981LP3ETR from Analog Devices Inc. is an active bias controller designed to automatically adjust the gate voltage of external amplifiers to achieve constant bias current. This component is particularly useful for biasing both enhancement and depletion type amplifiers operating in the Class-A regime. It offers a comprehensive biasing solution with drain voltages ranging from 4V to 12V and drain currents up to 200mA. The HMC981LP3ETR 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 | Value |
|---|---|
| Supply Voltage (VDD) | 4V to 12V |
| Digital Voltage (VDIG) | 3.3V to 5V |
| Drain Current | Up to 200mA |
| Gate Current Capability | ±0.8 mA |
| Package Type | 16-Lead QFN (3mm x 3mm w/ EP) |
| Thermal Characteristics | RoHS compliant with exposed backside pad |
| Internal Negative Voltage Generation | Optional |
| Short Circuit Protection | Yes |
Key Features
- Automatic gate voltage adjustment without calibration requirements.
- Supports both enhancement and depletion type amplifiers.
- Adjustable drain current up to 200mA.
- Internal negative voltage generation for depletion mode amplifiers (optional).
- Gate control can both sink and source current (±0.8 mA).
- Integrated control circuitry for safe power-up and power-down sequencing.
- Short circuit protection feature.
- External low voltage bias rail (VDIG) for internal logic circuitry.
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 HMC981LP3ETR? The HMC981LP3ETR is an active bias controller that automatically adjusts the gate voltage of external amplifiers to achieve constant bias current.
- What types of amplifiers can the HMC981LP3ETR bias? It can bias both enhancement and depletion type amplifiers operating in the Class-A regime.
- What is the range of supply voltage for the HMC981LP3ETR? The supply voltage range is from 4V to 12V.
- What is the maximum drain current supported by the HMC981LP3ETR? The maximum drain current is up to 200mA.
- Does the HMC981LP3ETR require calibration? No, it does not require calibration due to its automatic gate voltage adjustment feature.
- What package type is the HMC981LP3ETR available in? It is available in a 16-Lead QFN (3mm x 3mm w/ EP) package.
- Does the HMC981LP3ETR have short circuit protection? Yes, it has a built-in short circuit protection feature.
- What is the purpose of the internal negative voltage generation in the HMC981LP3ETR? The internal negative voltage generation is optional and used to drive depletion mode amplifiers.
- How does the HMC981LP3ETR ensure safe power-up and power-down sequencing? It employs integrated control circuitry to ensure safe power-up and power-down sequencing of the targeted amplifier.
- What are some common applications of the HMC981LP3ETR? Common applications include microwave radio, military and space, test instrumentation, fiber optic modulator driver biasing, and more.
