The LT5568-2 is a direct I/Q modulator designed for high performance wireless applications, including wireless infrastructure. It allows direct modulation of an RF signal using differential baseband I and Q signals. It supports GSM, EDGE, CDMA, CDMA2000 and other systems that operate in the 850MHz to 965MHz band. It may be configured as an image reject upconverting mixer, by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband inputs consist of voltage-to-current converters that in turn drive double-balanced mixers. The outputs of these mixers are summed and applied to an on-chip RF transformer, which converts the differential mixer signals to a 50Ω single-ended output. The four balanced I and Q baseband input ports are intended for DC coupling from a source with a common mode voltage level of about 0.5V. The LO path consists of an LO buffer with single-ended input, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V. Applications * Infrastructure Tx for GSM/Cellular Bands * Image Reject Up-Converters for Cellular Bands * Low-Noise Variable Phase-Shifter for 700MHz to 1050MHz Local Oscillator Signals * RFID Reader * Optimized Image Rejection for 850MHz to 965MHz * High OIP3: +22.9dBm at 900MHz * Low Output Noise Floor at 5MHz Offset: * No RF: –159.4dBm/Hz * POUT = 4dBm: –153dBm/Hz * Integrated LO Buffer and LO Quadrature Phase Generator * 50Ω AC-Coupled Single-Ended LO and RF Ports * 50Ω DC Interface to Baseband Inputs * Low Carrier Leakage: –43dBm at 900MHz * High Image Rejection: –52dBc at 900MHz * 16-Lead 4mm × 4mm QFN Package https://elecena.pl/product/2187812/gsm-edge-optimized-high-linearity-direct-quadrature-modulator 2011-10-12 https://elecena.pl/product/2187812/gsm-edge-optimized-high-linearity-direct-quadrature-modulator 2014-06-11 https://elecena.pl/product/2187812/gsm-edge-optimized-high-linearity-direct-quadrature-modulator 2025-01-19