The source-free dual-balanced broadband mixer chip GX5552/5553 replaces LTC5552/5553 in phased array radar applications

Phased array radar technology is a radar technique that electronically controls the phase and amplitude of the feed signals in the radiating elements of an antenna array, enabling rapid changes in beam direction and shape. In a phased array radar system, the broadband mixer is responsible for combining the radio frequency signal with the local oscillator signal to generate an intermediate frequency signal, serving as a critical link in the signal processing chain.

The most critical performance parameters of broadband mixers include conversion gain, linearity, noise figure, and operating bandwidth. The baluns used in integrated mixers significantly impact the performance of all these mixers. Key performance metrics of integrated baluns include operating frequency range, insertion loss, amplitude/phase balance, common-mode rejection ratio (CMRR), and physical dimensions.

The passive double-balanced broadband mixer chip GX5552/5553 from GXSC integrates an internal RF balun, supporting a broadband operating frequency range of 3~20GHz. It features an internal LO amplification chain, enabling local oscillator operation from 1~20GHz with a typical LO power requirement of only 0dBm. Additionally, it incorporates an IF balun to support single-ended 50Ω operation for intermediate frequencies ranging from 0.5~9GHz. The chip operates on a single 3.3V power supply, ensuring versatility across various applications.

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GXSC Broadband Mixer Chip GX5552/5553 Main Performance Specifications:  

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RF operating bandwidth: 3~20GHz

LO operating bandwidth: 1~20GHz

IF operating bandwidth: DC~6GHz

```Downconversion input P-1dB: 16dBm (typical value)```

```P-1dB of upconversion mixer input: 13dBm (typical value)```

Downconverter IIP3: 27dBm (typical value)

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The target language for translation is English.  

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Upconverter IIP3: 23dBm (Typical Value)  

Translated Content:  

```Upconverter IIP3: 23dBm (Typical Value)```

Down conversion loss: 10 dB (typical value)

Up-conversion loss: 8 dB (typical value)

```Required LO power: 0dBm (typical value)```

Voltage/Current: 3.3V/146mA (typical value)

Chip dimensions: 3mm × 2mm

Operating temperature range: -40°C to 125°C

Due to the presence of strong interference signals in phased array radar systems, the mixer must have high linearity to avoid signal distortion. The GX5552/5553 features excellent linearity (input P-1dB and IIP3) and integration, enabling the chip to accurately process signals of varying strengths in complex electromagnetic environments. This prevents the generation of additional spurious signals that could interfere with the system‘s detection and identification of target signals.