HMC684LP4ETR RF/IF and RFID

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RF mixers are circuit elements used to convert an input signal to an output signal at a different frequency. They have the ability to provide a conversion gain, add a bias current as an input, or shape the frequency response according to specific parameters. HMC684LP4ETR is an active double-balun RF mixer with integrated DC bias circuitry that delivers broad bandwidth, high dynamic range and high linearity performance in the 0.04 - 4.0 GHz frequency range. Along with increased system linearity, this mixer offers two separate ports for easy RF and LO integration.

The application field of the HMC684LP4ETR includes point-to-point microwave, satellite communication systems, military communication systems, cellular base station receivers, and other radio systems that require wide bandwidth. Additionally, it is widely used in selective modulation, narrowband and frequency-hopping applications.

This mixer consists of two frequency-independent balanced mixers along with two resistively-fused resistors and active buffer cells as the impedance matching and DC bias blocks. On-chip DC and bias circuitry, integrated with the mixer core, eliminates the necessity of additional external DC bias components. The resistively-fused resistors supply the control voltage required by the mixer core unit, dynamically controlling its operation in full gain or gain-off modes.

The HMC684LP4ETR contains a low-noise (NF) amplifier integrated in the mixer input buffer stage. This linear amplifier delivers an excellent conversion gain over its entire operating range with a typical 3 dB noise figure for applications requiring low noise. The two-in-one double balun architecture ensures high linearity performance with very low distortion compared to single balanced RF/LO pinouts.

The HMC684LP4ETR can also be used as a frequency converter in the conversion of signals between two frequency bands. It is designed to provide a high level of linearity and provide good noise performance. By utilizing two LO ports, the mixer acts as a frequency doubler with very high LO to RF isolation. This feature provides for the protection of the LO signal against high level input signals.

The HMC684LP4ETR provides high isolation between the input and output ports, allowing isolation of both RF and LO signals. By utilizing two separate ports and integrated DC bias circuitry, the circuit can be used to reduce spurious signals from the output port for improved linearity performance.

In conclusion, the HMC684LP4ETR has a very wide range of applications due to its wide bandwidth, low noise, high linearity, and excellent isolation performance. Its integrated DC bias and two separate ports make it easy to integrate into circuits for improved performance and efficiency. Additionally, its resistively-fused resistors provide improved dynamic control over the mixer gain, making it suitable for applications requiring frequency conversion or selective modulation.

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