Demodulator Flaunts PGA With 24 dB Of Gain Range

Compared tosuperheterodyne architectures, a monolithic, high-linearity quadrature demodulator is vowing to reduce the component count of the receive signal chain in third-generation (3G) base stations by at least 75 percent. The TRF3710 demodulator integrates a baseband filter that is software-programmable with 1-dB corner frequency. It can continuously cover signal bandwidths of 615 kHz (single-carrier CDMA2000) to 1.92 MHz (single WCDMA carrier). The device includes a programmable gain amplifier (PGA) with 24 dB of gain range in 1-dB increments. In addition, an analog-to-digital-converter (ADC) driver allows for direct connection to the ADC. The device provides a high-linearity receiver and superior RF performance with an input second-order intercept point of +60 dB, input third-order intercept point of +21 dB, and a noise figure of 13.5 dB.