HMC718LP4E

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RF Amplifiers

The HMC718LP4E is a monolithic GaAs 12Gbps limiting amplifier designed to provide a very high level of small signal gain and ultra wide bandwidth from dc to 12GHz with very fast rise/fall times. It is a digitally controlled variable gain amplifier (VCA) with a gain control range of -30dB up to +2dB and a tracking error of typically 0.4dB over frequency, temperature, and voltage. It is meant to be used across multiple application areas including digital video transmission, high bit rate data transmission, pulse position modulation, and pulse code modulation-based systems.

The HMC718LP4E operates on a single 5V supply with a maximum current consumption of 250mA. It has four control pins which allow the gain to be altered in four independent steps. Furthermore, an external resistor can be used to provide a continuous current to offset the gain when desired. The amplifier also has a built-in limit feature which limits the output at 6mV for switching signals. This allows high speed operation of the amplifier without the need for limiting resistors.

The HMC718LP4E has a minimum small signal gain of 12dB with typical gain of 13.5dB up to 8GHz. Gain flatness is typically ±2.0dB over the full frequency range with an input and output return loss of better than 10dB. Noise figure drops below 1dB at 8GHz and is typically 1.7dB at the maximum frequency. The current limiting feature allows for stable gain under all conditions with no visible effect on gain flatness or phase characteristics.

The HMC718LP4E amplifier can be used in many various application fields. In particular, it is ideal for high speed communication and video transmission systems and is suitable for design and fabrication of high speed measurement instruments. It is also suitable for use in radio frequency (RF) test systems where the dynamic range and bandwidth of the amplifier are needed.

The working of the HMC718LP4E is simple and uncomplicated. It acts as a voltage-controlled amplifier whose gain is determined by the magnitude of input voltage from its control pins. The amplifier has four control pins (A-D) which receive a voltage from an external control source. As the voltage on each of these control pins increase, the gain of the amplifier varies from its minimum gain to its maximum gain. Additionally, an external resistor can be used to offset the gain when desired.

The HMC718LP4E is an ideal choice for high speed applications, offering excellent performance and low noise figures in a compact package. It provides a wide frequency range and a wide range of gain settings. In addition, it is easy to control, with its fast settling time and current limiting feature making it suitable for dynamic RF applications.

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