Demodulator aims to reduce components by 75%

Texas Instruments (TI) has introduced a new monolithic quadrature demodulator for direct down conversion applications. The company reports that its new device reduces the component count of the receive signal chain in 3G base stations by at least 75 percent as compared to superheterodyne architectures. The TRF3710 demodulator integrates all of the devices required to go directly from RF to baseband.

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 1-dB corner frequency, which can continuously cover signal bandwidths of 615 kHz (single carrier CDMA2000) to 1.92 MHz (single WCDMA carrier).

The device also includes a programmable gain amplifier with 24-dB of gain range in 1-dB increments, and an analog-to-digital converter (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 phase-locked loop (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 available now packaged in a 48-pin quad flat no-lead (QFN) package. The TRF3710 is priced at $9.75 each in 1,000 piece quantities.
Click here for more product information, or contact Texas Instruments at 1-800-477-8924.

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