Column Control DTX

HMMC-5021, HMMC-5022, HMMC-5026, and QMMC-5002 GaAs MMIC Traveling Wave Amplifier

Data Sheets

Description

The HMMC-5021/22/26/QMMC-5002 is a broadband GaAs MMIC traveling wave amplifier designed for high gain and moderate output power over the full 2 to 26.5 GHz frequency range. Seven MESFET cascode stages provide a flat gain response, making the HMMC-5021/22/26/QMMC-5002 an ideal wideband gain block. Optical lithography is used to produce gate lengths of ≈ 0.4 μm. The HMMC-5021/22/26/QMMC-5002 incorporates advanced MBE technology, Ti-Pt-Au gate metallization, silicon nitride passivation, and polyimide for scratch protection.

Applications

The HMMC-5021/22/26/QMMC-5002 Series of traveling wave amplifiers are designed for use as general-purpose wideband gain blocks 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.

It is characteristic of traveling wave amplifiers that S22 tends to 0 dB and greater out of band. This is the design trade-off for the broadband performance of TWAs. As a consequence, TWAs are not necessarily unconditionally stable out of band. This means that if a TWA is followed by a reflective low-pass filter, oscillations can occur. This phenomenon is exacerbated by low temperature where the gain is higher. More data will follow on individual 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-5021/22/26/QMMC-5002 are VDD = 7.0 V, IDD = 150 mA for best overall performance. To achieve this drain current level, VG1 is typically biased between –0.2 V and –0.5 V. No other bias supplies or connections to the device are required for 2 to 26.5 GHz operation. See Figure 3 for assembly information.

The auxiliary gate and drain contacts are used only for low-frequency performance extension below ≈ 1.0 GHz. When used, these contacts must be AC coupled only. (Do not attempt to apply bias to these pads.)

The second gate (VG2) can be used to obtain 35 dB (typical) dynamic gain control.

For normal operation, no external bias is required on this contact and its self-bias volt- age is ≈ +2.1 V. Applying an external bias between its open-circuit voltage and –2.5 volts will adjust the gain while maintaining a good input/output port match.

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Column Control DTX