HMMC-5629 DC-26.5 GHz HBT Limiting Amplifier

Introduction

The HMMC-5629 is a DC – 26.5 GHz, 20 dB gain differential limiting amplifier designed to be used as a general purpose gain block for a variety of applications. The device consists of three differential pair stages and provides 75 Ω input/output port matches to reduce power dissipation. Furthermore, this amplifier is fabricated using HFTC’s HB2B InP HBT process which provides excellent process uniformity, reliability, and 1/f noise performance. The device requires a single negative supply voltage and dissipates less than 0.165 Watts from a -3.3 V supply.

Absolute Maximum Ratings 1

DC Specifications/Physical Properties 1

Frequency-Domain RF Specifications 1

Biasing

In nominal operation the HMMC-5629 is biased with a single negative 3.3 V supply applied to the Vee pin and the Iadj pin is grounded.

Additionally, if a precise output voltage is required, a precision current source can be applied to the Iadj pin. This reference current is nominally set to 4 mA and must not be less than 3 mA nor greater than 5 mA. During power-up, first set Vee to -3.3 V then set the current into the Iadj pin to 4 mA. When powering down, set Iadj to 0 mA or disconnect then turn down Vee.

The common mode output voltage can be monitored at the Vcm pin and two anti-polar temperature diodes connected between the TD pin and ground can be used to stabilize the output voltage over temperature.

Assembly Techniques

The HMMC-5629 is fabricated using an InP-based HBT semiconductor material structure which limits the maximum assembly temperature to 150°C. Due to the fact AuSn solder dieattach temperatures exceed this limit, only epoxy-based die-attach materials and processes (such as 84-1LMI) should be employed during HMMC-5629 assembly.

GaAs and InP MMICs are ESD sensitive. ESD preventive measures must be employed in all aspects of storage, handling, and assembly.

Keysight application note #54, “GaAs MMIC ESD, Die Attach, and Bonding Guidelines” provides basic information on the subjects.