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Linear Tech demodulator eyes portable apps

Posted: 16 Dec 2003 ?? ?Print Version ?Bookmark and Share

Keywords:lt5546? if quadrature demodulator? linear technology?

A monolithic IF quadrature demodulator from Linear Technology Corp. operates with a single supply voltage as low as 1.8V.

Suitable for use in portable applications, the LT5546 targets GPS receivers, wireless local loops, satellite IF receivers, and mobile wireless data receivers. The device accepts an IF input signal from 40MHz to 500MHz, and incorporates a precision quadrature phase-shifter for I/Q demodulation and a low distortion variable gain amplifier (VGA) with a log-linear gain control range from -7dB to 56dB.

The demodulated I/Q baseband signals pass through on-chip 17MHz low-pass noise reduction filters in the LT5546, reducing the need for external filtering. The I/Q outputs are buffered by low distortion, high linearity amplifiers. When signals are momentarily too high due to excessive VGA gain, the product's output amplifiers limit symmetrically.

Featuring an on-chip signal power detector with a detection range of -30dBm to 8dBm to assist in high signal level detection and corresponding gain adjustment, the LTC5546 is offered in a 4-by-4mm 16-lead plastic QFN surface mount package and is priced at $3.35 each in 1,000-piece quantities.

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