HMC490

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The HMC490 is a high performance GaAs MMIC (monolithic microwave integrated circuit) distributed amplifier and active bias control circuit designed for a wide variety of RF amplifier applications. It is designed for use with a single 5V supply voltage, with an operating frequency range from DC to 6 GHz. With an output power of as high as 18 dBm (0.8 W) and a noise figure of close to 4 dB, the HMC490 is well suited for microwave and millimeter wave receiver front-ends, signal amplifiers, and repeaters for wireless applications such as WLAN and WiMAX.

The HMC490 is constructed from a dielectric-isolated, multi-stage distributed network that offers high impedance at all ports. This allows it to function as either a high gain distributed amplifier capable of delivering high output power and low noise figure, or as a high isolation device with excellent out-of-band rejection. It also has a wide range of bias voltage control capabilities which allow for precise input impedance matching and low noise figure.

The core of the HMC490 is a fully differential distributed amplifier structure designed to provide wide dynamic range and wideband performance with low noise figure. The amplifier is a 3-stage cascode design, with each stage being a combination of a pair of differential transistors. The device also incorporates a voltage-controlled bias circuit that provides precise input impedance matching and low noise figure. The output stage is fully matched to 50 ohms for optimum performance.

The HMC490 offers excellent gain flatness and wide bandwidth performance. With a 5 V single supply, it operates from DC to 6 GHz with a typical gain of 16 dB and a maximum gain of 19 dB. The upper 3 dB bandwidth is typically 3.6 GHz. The device also exhibits very good input and output gain matching, with a typical gain of 16 dB over a frequency range of 800 MHz to 6 GHz. In terms of linearity, the HMC490 has a typical IP3 of 28 dBm, a typical drain efficiency of 50%, and a typical reverse isolation of 25 dB. The HMC490 is also highly integrated, requiring only a few external components to operate.

In addition to being well suited for a wide range of RF amplifier applications, the HMC490 also has a wide range of bias voltage control capabilities which allow it to be used for low noise applications. The control circuit offers adjustable DC bias voltage from 1.5 V to 5 V, allowing precise input impedance matching and low noise figure tuning. This makes it ideal for applications such as low noise amplifiers and receivers, as it provides tight control of gain and noise figure. The HMC490 also includes circuitry for monitoring the bias voltage, allowing for easy adjustment of the operating point.

Overall, the HMC490 is an excellent choice for a wide variety of RF amplifier applications. With its wide operating frequency range, low noise figure, high gain, wide bandwidth, and integrated bias control, the HMC490 is ideal for point-to-point communications, satellite transceivers, and mobile radio applications.

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