The LTC554x series of passive mixers achieve the lowest noise figure with high linearity. The series offers excellent performance and is widely used in wireless infrastructure designs.
The LTC554x family of passive downconverting mixers is designed to cover frequencies from 600MHz to 4GHz. Unlike legacy passive mixers that typically exhibit conversion loss, the LTC554x integrates IF amplifiers to deliver up to 8dB of overall conversion gain and low noise figure (NF). This high gain allows for additional insertion loss in high-selectivity IF SAW filters while maintaining receiver sensitivity and spurious-free dynamic range requirements. The document compares these passive mixers against active counterparts, highlighting superior linearity and NF under blocking conditions.
The mixers cover frequencies from 600MHz to 4GHz.
The mixers produce 8dB of overall conversion gain.
The NF increases only 6dB from the small-signal value to 16.2dB.