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From RF to baseband in one demodulator

Posted: 25 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:monolithic quadrature demodulator? direct down conversion? 3G?

A monolithic quadrature demodulator for direct down conversion applications has been introduced by Texas Instruments Inc. (TI). The TRF3710 demodulator integrates all of the devices required to go directly from RF to baseband, reducing the component count of the receive signal chain in 3G base stations by at least 75 percent as compared to superheterodyne architectures.

The TRF3710 is optimized for use in direct down-conversion architectures where space and cost savings are key requirements. TI reports that this is the first RF device in the industry to integrate a baseband filter that is software-programmable with 1dB corner frequency, which can continuously cover signal bandwidths of 615kHz (single carrier CDMA2000) to 1.92MHz (single WCDMA carrier).

The device also includes a programmable gain amplifier with 24dB of gain range in 1dB increments, and an ADC driver that allows for direct connection to the ADC. The TRF3710 eliminates the need for many of the receive signal chain components, including filters, mixers, a PLL or voltage-controlled oscillator (VCO), RF and baseband amplifiers. The TRF3710 directly converts the RF signal to complex baseband, which reduces system cost by eliminating the need for premium, high-IF and high sample-rate ADCs. Additionally, the device provides RF performance of input second-order intercept point (IIP2) of 60 dB, IIP3 of 21 dB, and a noise figure of 13.5 dB. The TRF3710 is packaged in a 48-pin quad flat no-lead (QFN) package.

- Janine Love
RF Designline




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