Overview
The HMC920LP5E is an active bias controller designed by Analog Devices Inc. This component is engineered to generate a regulated drain voltage and actively adjust the gate voltage of an external amplifier to achieve a constant bias current. It is suitable for biasing both enhancement and depletion type amplifiers operating in Class-A regime, with drain voltages ranging from 3V to 15V and drain currents up to 500mA. The HMC920LP5E ensures excellent bias stability over supply, temperature, and process variations, eliminating the need for calibration procedures that prevent RF performance degradation.
Key Specifications
| Parameter | Symbol | Value |
|---|---|---|
| Single Positive Voltage Supply | Vdd | 5V to 16.5V |
| Adjustable Drain Voltage | VDRAIN | 3V to 15V |
| Adjustable Drain Current | IDRAIN | Up to 500mA |
| Internal Negative Voltage Generator | VNEG | -2.5V |
| Gate Control Current | ±VGATE | ±4 mA |
| Package Type | 32-VFQFN Exposed Pad Surface Mount | |
| Operating Temperature | TA | -40°C to +85°C |
Key Features
- Active bias current regulation for stable bias current over temperature and process variations.
- Short circuit protection with power foldback.
- Adjustable over/under-current alarm and low Vdd voltage alarm.
- Automated power-up sequencing.
- Enable input for active bias control and trigger-out output for daisy chain power-up.
- Internal negative voltage generator for depletion mode devices.
- High-voltage, high-current linear regulator (LDOCC) adjustable from 3V to 15V.
Applications
The HMC920LP5E is designed for use in various RF and microwave applications, including but not limited to:
- Biasing of enhancement and depletion type amplifiers in Class-A regime.
- RF and microwave amplifiers requiring stable bias current.
- Systems needing automated power-up sequencing and alarm functions.
- Applications requiring high stability over temperature and process variations.
Q & A
- What is the primary function of the HMC920LP5E?
The HMC920LP5E is an active bias controller that generates a regulated drain voltage and adjusts the gate voltage of an external amplifier to achieve a constant bias current. - What is the voltage range for the single positive voltage supply?
The single positive voltage supply range is from 5V to 16.5V. - What is the maximum drain current supported by the HMC920LP5E?
The maximum drain current supported is up to 500mA. - Does the HMC920LP5E have internal negative voltage generation?
Yes, it generates a -2.5V negative voltage for depletion mode devices. - What type of package does the HMC920LP5E come in?
The HMC920LP5E is housed in a 32-VFQFN Exposed Pad Surface Mount package. - What are the key features of the HMC920LP5E’s power management?
Key features include short circuit protection, power foldback, adjustable over/under-current alarm, and automated power-up sequencing. - How does the HMC920LP5E ensure bias stability?
The HMC920LP5E ensures excellent bias stability over supply, temperature, and process variations. - Can the HMC920LP5E be used for both enhancement and depletion type amplifiers?
Yes, it can be used for both types of amplifiers. - What is the purpose of the LDOCC output in the HMC920LP5E?
The LDOCC output is an adjustable high-voltage, high-current linear regulator that provides the drain supply rail for the external RF amplifier. - How can the drain voltage be adjusted in the HMC920LP5E?
The drain voltage can be adjusted through external resistors R8 and R5.
