QHX220 Datasheet | Intersil

Active Isolation Enhancer and Interference Canceller Electromagnetic Interference (EMI) is emerging as a major concern in next generation wireless munication systems. As wireless terminals now support multiple services and Features that utilize high data rates simultaneously, removing interference within wireless terminals like handsets has bee a challenge. Reducing the Electromagnetic Interference recovers the receiver sensitivity, enabling simultaneous operation of multiple radios, and improves the overall quality of service of munication devices. Intersil’s QHx220 is situated in a handset to sample the source of the noise and emulate the RF coupling channel between the noise source and victim receiver antenna. In doing so, an anti-noise signal can be applied directly to the victim receive path to cancel the EMI and achieve the signal integrity benefits. This approach makes it possible to cancel both in-band (within the victim Rx band) or out-of-band aggressors. This is a revolutionary approach since it is only possible to cancel out of band noise using conventional Rx filters. In addition QHx220 may be used to increase the inherent isolation between antennas or inside duplexers and switches, thus allowing to increase the transmit power in repeaters or yielding higher sensitivity in the receivers. Both measures finally resulting in a better coverage, larger cell size, smaller antennas or lower power of infrastructure ponents such as basestations, pico-and Femtocells as well as repeaters. The QHx220 integrates the sampler path LNA gain stages as well as the DACs required to control the I and Q control voltages (used to set the magnitude and phase of the cancellation signal). Both the gain, and control .. voltages are programmable using a SPI bus interface. Features - Protocol agnostic. Designed for: GSM, CDMA, DVB-H, ISDB-T, DMB - Frequency Range 300MHz to 3GHz - Integrated, programmable LNA gain stages in the sampler...