Signal-level adjustments are often necessary over some portion of an operating bandwidth. The addition of attenuation or amplification to a circuit can typically control signals that may be too high or too low in level, respectively. For signals through 6 GHz, at least, a series of monolithic-microwave-integrated-circuit (MMIC) amplifiers from Mini-Circuits can help with signal gain adjustments. Based on indium-gallium-phosphide (InGaP) heterojunction-bipolar-transistor (HBT) active devices, these RoHS-compliant monolithic amplifiers are usable from 10 MHz to 6 GHz. Each amplifier is bonded to a multilayer low-temperature-cofired-ceramic (LTCC) substrate for thermal stability and hermetically sealed under a controlled nitrogen atmosphere. These monolithic amplifiers are housed with gold-plated covers and eutectic gold-tin (AuSn) solder in packages measuring only 3 x 3 x 1.14 mm.

The compact MMIC amplifiers (see figure) are available for operating voltages from +3 to +6 VDC and designed for operating temperatures from −55 to +105°C. As an example, model CMA-62+ operates from 10 MHz to 6 GHz with more than 16-dB small-signal gain at the lower frequencies, dropping somewhat at higher frequencies. The gain is typically 16.6 dB at 50 MHz, 15.4 dB at 2 GHz, and 13.7 dB at 6 GHz, with associated noise figures of typically 4.8, 5.4, and 5.7 dB at those three frequencies. The gain flatness is typically within ±0.6 dB from 0.05 to 3.0 GHz and ±0.1 dB from 0.7 to 2.6 GHz. The broadband amplifier exhibits typical reverse isolation of 21.9 dB at 2 GHz.

Model CMA-62+ provides output power at 1-dB compression of typically +19.9 dBm at 50 MHz, +19.2 dBm at 2 GHz, and +11.9 dBm at 6 GHz. The output third-order intercept point (IP3) is typically +39.0 dBm at 10 MHz, +33.4 dBm at 2 GHz, and +23.2 dBm at 6 GHz. The amplifier exhibits input return loss of 16.5 dB at 50 MHz, 14.7 dB at 2 GHz, and 13.9 dB at 6 GHz, with output return-loss performance levels of 14.1, 14.0, and 14.0 dB, respectively, at those three frequencies. In fact, the input and output return loss typically ranges from 10 to 23 dB for frequencies as high as 7 GHz, even without additional impedance-matching components. Model CMA-62+ is an efficient gain block, typically drawing only 82 mA from a +5-VDC supply.

For applications that may require more gain across that same frequency range, MMIC amplifier model CMA-63+ is also usable from 0.01 to 6.00 GHz, with typical gain of 21.9 dB at 50 MHz, 20.3 dB at 2 GHz, and 14.4 dB at 6 GHz. It maintains gain flatness within ±1.5 dB from 0.05 to 3.00 GHz and ±1.2 dB from 0.7 to 2.6 GHz. It delivers typical output power at 1-dB compression of +18.7 dBm at 50 MHz, +18.4 dBm at 2 GHz, and +11.7 dBm at 6 GHz, with output IP3 levels of typically +34.6 dBm at 50 MHz, +32.0 dBm at 2 GHz, and +25.3 dBm at 6 GHz. The rugged amplifier boasts reverse isolation of typically 23.7 dB at 2 GHz. Model CMA-63+ offers noise figures of 3.7 dB at 50 MHz, 3.9 dB at 2 GHz, and 4.6 dB at 6 GHz, and typically draws 69 mA current from a +5-VDC supply.

Where linearity and noise figure may be issues, MMIC HBT amplifier model CMA-545+ is usable from 50 MHz to 6 GHz, with low noise figures of 1.3 dB at 50 MHz, 1.2 dB at 2 GHz, and 2.5 dB at 6 GHz. It provides typical gain of 26.2 dB at 50 MHz, 14.8 dB at 2 GHz, and 6.6 dB at 6 GHz, with typical gain flatness within ±1.5 dB from 0.05 to 3.00 GHz and ±1.2 dB from 0.7 to 2.6 GHz. Model CMA-545+ achieves typical output power at 1-dB compression of +19.9 dBm at 50 MHz, +20.0 dBm at 2 GHz, and +21.0 dBm at 6 GHz, with typical output IP3 levels of +32.0 dBm at 50 MHz, +37.1 dBm at 2 GHz, and +36.6 dBm at 6 GHz. This lower-noise amplifier draws just 80 mA current from a +3-VDC supply.

These compact amplifiers are matched to 50 Ω input and output impedance and do not require additional matching components even with their broad frequency ranges. A great deal of care has been put into achieving high reliability with the InGaP HBT process and in maintaining that reliability through proper packaging. The amplifiers feature excellent electrostatic-discharge (ESD) protection, having been tested to Class 1C requirements for the human body model (HBM). The amplifiers meet the applicable requirements of MIL-STD-202, MIL-STD-750, and MIL-STD-883 for hermeticity, acceleration, vibration, mechanical shock, and temperature cycling.

Mini-Circuits, Inc.
P.O. Box 350166
Brooklyn, NY 11235-0003
(718) 934-4500
FAX: (71) 332-4661