The LT5515 is a 1.5GHz to 2.5GHz direct conversion orthogonal demodulator optimized for high linearity receiver applications. It is suitable for communication receivers that convert RF signals directly into I and Q baseband signals with bandwidths up to 260MHz.
Typical application
The LT5515 integrates balanced I and Q mixers, LO buffering amplifiers, and a precision high frequency orthogonal generator. In RF receivers, the LT5515's high linearity provides excellent spurless dynamic range, even with fixed-gain front-end amplification.
Block diagram
This direct conversion receiver can eliminate the processing of intermediate frequency (IF) signal and the corresponding requirements of image filtering and if filtering. Channel filtering can be performed directly at the output of the I and Q channels. These outputs can be connected directly to channel selective filters (lpf) or baseband amplifiers.
Test circuit
Features
● Frequency range :1.5GHz to 2.5GHz
● 20dBm at high IIP3:1.9GHz
● High IIP2: 51dBm at 1.9GHz
● Noise pattern: 16.8dB at 1.9GHz
● Conversion gain: -0.7dB at 1.9GHz
● I/Q gain mismatch :0.3dB
● I/Q phase mismatch :1°
● Shutdown mode
● 16 lead QFN 4mm x 4mm package the liner is exposed
Applications
● Mobile phone/computer/UMTS infrastructure
● High linearity direct conversion I/Q receiver
● High linear I/Q demodulator
● RF power amplifier linearized
