850MHz to 1550MHz SiGe Mixer Delivers Unparalleled Spurious Intermodulation Rejection
Maxim has introduced the MAX2051, a high performance, fully integrated, 815MHz to 1550MHz SiGe passive mixer. Designed specifically for multicarrier cable head-end downstream video, cable modem termination systems (CMTS), video-on-demand and DOCSIS(R)-compliant edge QAM modulation, and wireless-infrastructure applications, the MAX2051 delivers an unparalleled combination of linearity and spurious suppression over an exceptionally wide IF bandwidth of 50MHz to 1000MHz.When
As an upconverter, the MAX2051 delivers equally impressive performance with 33.4dBm of IIP3, a low conversion loss of only 7.5dB, and better than 61dBc of LO ±2IF and 78dBc of LO ±3IF suppression. This device is ideal for all point-to-point and point-to-multipoint microwave and fixed broadband wireless-access base-station applications, which require first IF to second IF upconversion stages covering the 850MHz to 1550MHz band.
Maxim's proprietary SiGe process enables the MAX2051 to integrate a state-of-the-art, double-balanced mixer core with an LO amplifier, two baluns, plus dozens of discrete components-all into one monolithic device. When compared to the closest competing solution, the MAX2051 reduces the total board space by 72%, and reduces the discrete part count by 25%. The device's outstanding spurious performance also eases the filtering requirements of close-in harmonics, thus enabling simpler, smaller, and more cost-effective filter designs.
To complement the mixer's exceptionally wide IF range, the MAX2051 includes a similarly wide-range LO buffer circuit that is optimized for high-side LO injection architectures covering the 1200MHz to 2250MHz frequency spectrum. The on-board 0dBm drive LO buffer provides ±3dB drive-variance control, thus ensuring stable gain, NF, and IIP3 performance over temperature, supply, and input power. The MAX2051 also has excellent gain-variation performance of 0.01dB/degree Celsius over the -40 degrees Celsius to +85 degrees Celsius industrial temperature range.