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HMMC-5027 2-26.5 GHz Medium Power Amplifier

Data Sheets

Description

The HMMC-5027 is a broadband GaAs MMIC traveling wave amplifier designed for medium output power and moderate gain over the full 2 to 26.5 GHz frequency range. Seven MES-FET cascode stages provide a flat gain response, making the HMMC-5027 an ideal wideband power block. Optical lithography is used to produce gate lengths of ≈0.5 μm. The HMMC-5027 incorporates advanced MBE technology, Ti-Pt-Au gate metallization, silicon nitride passivation, and polyimide for scratch protection.

Applications

The HMMC-5027 series of traveling wave amplifiers are designed for use as general purpose wideband power stages in communication systems and microwave instrumentation. They are ideally suited for broadband applications requiring a flat gain response and excellent port matches over a 2 to 26.5 GHz frequency range. Dynamic gain control and low-frequency extension capabilities are designed into these devices.

Biasing and Operation

These amplifiers are biased with a single positive drain supply (VDD) and a single negative gate supply (VG1). The recommended bias conditions for the HMMC-5027 are VDD = 8.0 V, IDD = 250 mA or IDSS, whichever is less. To achieve this drain current level, VG1 is typically biased between 0 V and –0.6 V. No other bias supplies or connections to the device are required for 2 to 26.5 GHz operation. The gate voltage (VG1) MUST be applied prior to the drain voltage (VDD) during power up and removed after the drain voltage during power down. See Figure 3 for assembly information.

The HMMC-5027 is a DC coupled amplifier. External coupling capacitors are needed on RFIN and RFOUT ports. The drain bias pad is connected to RF and must be decoupled to the lowest operating frequency.

The auxiliary gate and drain contacts are provided when performance below 1 GHz is required. Connect external capacitors to ground to maintain input and output VSWR at low frequencies (see Additional References). Do not apply bias to these pads.

The second gate (VG2) can be used to obtain 30 dB (typical) dynamic gain control. For normal operation, no external bias is required on this contact and its self bias potential is between +1.5 and +2.5 volts. Applying an external bias between its open circuit potential and –2.5 volts will adjust the gain while maintaining a good input/output port match.

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