HMC351S8TR

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RF mixers are devices that are designed to intermix signals within radio frequencies. They are typically used to convert electrical signals into higher or lower frequencies for various applications. The HMC351S8TR is an RF mixer that is especially suited for downconverting signals located in the microwave and millimeter-wave range (8 - 20GHz). It is designed for high linearity and low noise applications, features an integrated wideband LO amplifier, and has a very wide instantaneous frequency range from 2.7 to 20 GHz.

The typical application field of HMC351S8TR mixer is shown below.

• Wireless Systems
• Zigbee Radios
• Radio Tuners
• Wireless Base/Mobile Stations
• Microwave Point-to-Point Systems
• Wideband Receivers
• Satellite Communications

In these applications, the HMC351S8TR is an ideal choice for downconverting signals from any frequency within its input instantaneously frequency range to a lower intermediate frequency (IF).

The figure shows the typical operational block diagram of the HMC351S8TR. The basic concept of RF mixers is to take two input signals, the RF and the Local Oscillator (LO), and compare their frequency. The mixing process results in the generation of two new signals at the difference frequency (fDIF), and the sum frequency (fSUM).

The HMC351S8TR achieves RF-LO balance over the entire operating frequency range. The output ports of the mixer are differential and can be configured for single-ended operation. The LO port is quazzi-balanced and AC coupled, allowing the more conventional single-ended connections to be used. Two additional ports are also available, and are employed as diagnostic points for measurement.

The device is fabricated using Hittite’s advanced Gilbert cell-based quasi-balanced GaAs pHEMT process, which is ideal for providing excellent balanced mixer performance as well as superior linearity and gain. The mixer provides a large LOP1 compression of 16 dBm for each of the differential IF ports, with an LO drive requirement of only +12 dBm. It also features low additive noise of 5 dB NF and excellent image rejection of 50 dB or better.

In conclusion, the HMC351S8TR is an ideal RF mixer for downconverting signals from any frequency within its input instantaneous frequency range to a lower IF. It also features wideband LO amplifier, high linearity and low noise performance. Thanks to its advanced Gilbert cell-based semi-balanced GaAs pHEMT process, the mixer offers superior linearity and gain, as well as a large LOP1 compression and excellent image rejection.

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