HMC285E

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 The HMC285E is a high-performance active mixer from the Analog Devices Helical Mixer portfolio, which offers an impressive combination of wide operating temperature range (-55 to +105 °C), high dynamic range, and low conversion loss (14 dB typ) for the frequency range of 30MHz to 2.3GHz. It is a double balanced mixer, incorporating a 2 Stage Driver and 2 Stage LO Buffer, enabling the user to take advantage of a well-matched loop that helps optimize the performance of the circuit.

The HMC285E is widely used in many fields. It is often found in wireless communication systems such as Ka-Band receivers, satellite radio receivers and other test and measurement applications. It has a wide dynamic range of 35dB of IP3, noise figure of 4dB and excellent linearity, meaning it is well-suited for use in GSM or CDMA receivers.

The working principle of the HMC285E is quite complex. A crystal is used as a local oscillator to produce a signal that is fed to the mixer. The input is mixed with the oscillator signal, producing intermediate frequencies which can be processed electronically. The mixer is a non-linear device, meaning that when two signals are combined, the output frequency is neither equal to the input frequencies nor is it a linear sum. When an input frequency is multiplied or divided by a factor of two, the output signal is known as a harmonic signal.

The HMC285E has a two stage local oscillator buffer, comprised of transistors operating in a feedback loop. The LO buffer provides a controlled signal to driver stage, and its operation depends on the level of the signal given to it. Here, the driver stage is driven by a Low Noise Amplifier, and is optimized for low noise and high linearity so that the signal can be processed without significant distortion.

At the output stage of the HMC285E, the signal is out-of-phase with the local oscillator. The signal is then directed through a set of band stop filters, which allow only the output frequency to pass, eliminating any unwanted signal. Finally, an additional level of gain is applied to the signal using an amplifier, and the output signal is ready to be used for further processing.

In summary, the HMC285E from Stimulus Precision is an ideal mixers for RF applications which consume minimal power and offer excellent linearity and wide dynamic range. With features such as double balanced architecture, high linearity, wide temperature range, and low power consumption, it is widely used for RF and wireless communication applications.

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