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Marki Microwave recently introduced two GaAs PHEMT distributed amplifiers optimized for mixer and low phase noise applications.

The ADM-5974CH covers DC to 35 GHz with 14 dB small-signal gain, +22 dBm saturated output power, 6 dB noise figure, −153 dBc/Hz phase noise at 10 kHz offset and 16 dB return loss. This amplifier provides an efficient and optimized LO drive for Marki’s mixers and is well-suited for electronic warfare, clock distribution and test and measurement applications.

The second amplifier, the ADM-5931CH, covers DC to 28 GHz and provides 11 dB small-signal gain and +18 dBm saturated output power, drawing less than 85 mA DC bias current. The amplifier’s noise figure is 6 dB, phase noise is −153 dBc/Hz at 10 kHz offset, and the return loss is 16 dB. An efficient and low power solution, this amplifier is well-suited for use as a preamp or LO driver.

With a negative gate bias voltage, Marki Microwave’s GaAs PHEMT amplifiers are optimized to provide high even-harmonic suppression while generating high odd harmonics, to emulate a square wave with low rise and fall times. Marki’s mixers are designed to uniquely take advantage of this design approach. Fabricated with a low noise PHEMT process, Marki amplifiers work well in low phase noise applications.

The ADM-5974CH and ADM-5931CH are available as bare die, with enhanced moisture resistance to improve reliability. Marki also offers a selection of amplifiers in surface-mount, 3 mm x 3 mm and 4 mm x 4 mm QFN packages or multi-chip connectorized modules.

Marki Microwave
Morgan Hill, Calif.