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RF active mixers combine low power, high performance

Posted: 02 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:rf active mixer? linear technology? lt5525? lt5526?

Linear Technology Corp.'s new RF Active Mixers feature low power and high performance, making them suitable for wireless infrastructure transceiver and portable radio applications.

According to the company, both the LT5525 and LT5526 consume only one-half the power of other high performance mixers, while delivering excellent linearity to meet the requirements of cellular and wireless repeaters, pico-basestations, point-to-point wireless links and mobile radios.

The LT5526 features an IIP3 (Input Third-Order Intercept) of 16.5dBm at 900MHz, and a noise figure of 11dB. This performance is complemented by a conversion gain of 0.6dB, added Linear Tech. Moreover, the LT5526 requires only -5dBm LO drive, and its port-to-port LO leakage is -65dBm, reducing external filtering requirements. This device has fully differential inputs and outputs, and operates over a very wide bandwidth ranging from 100kHz to 2GHz. It has the capability for use as either a downconverting mixer or as an upconverting mixer in many applications.

Meanwhile, the LT5525 features an on-chip RF input transformer, and offers internal 50-ohm impedance matching at both the RF and the LO (Local Oscillator) inputs. These inputs can be driven single-ended, without external impedance matching components, thus facilitating ease-of-use and reducing costs. The LT5525's IIP3 is 21dBm IIP3 at 900MHz, and 17.6dBm at 1.9GHz. At 900MHz, the noise figure is 14dB and the conversion gain is -2.6dB. The LT5525 requires -5dBm LO drive, and offers high port-to-port isolation.

Both the LT5525 and LT5526 operate from a single supply voltage, ranging from 3.6V to 5.3V. Typical operating current is 28mA. They can operate at a supply voltage as low as 3V with reduced linearity performance.

Housed in a 16-pin 4-by-4mm surface mount QFN package, the LT5526 is priced at $3.40 and the LT5525 at $3.80, both in 1,000-piece quantities. The two products are available from stock.

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