Francesco Dantoni

A direct-conversion receiver for the 3G WCDMA standard

A highly integrated direct-conversion receiver that satisfies requirements of the third-generation wide-band code-division multiple-access mobile phone standard is described. The receiver integrated circuit includes the front-end low-noise amplifier, downconversion mixers, baseband variable-gain amplifiers, channel-select filters, and the frequency synthesizer. External components are limited to matching elements required for the low-noise amplifier and the mixers and two passive band-select filters. The receiver is implemented in a SiGe BiCMOS process and consumes a total current of 46 mA from a 2.7-V supply.

A direct conversion receiver for the 3G WCDMA standard

A highly integrated direct-conversion receiver that satisfies requirements of the third generation Wideband Code Division Multiple Access (WCDMA) mobile phone standard is described. The receiver IC includes the front-end low-noise amplifier, down-conversion mixers, channel select filters, baseband variable gain amplifiers, and the entire frequency synthesizer, including the voltage controlled oscillator, buffers and phase-locked loop.

A highly integrated GPS receiver for cellular handset

A highly integrated dual conversion heterodyne GPS receiver is reported. The receiver chip includes a 2.9 dB NF LNA, an image-reject mixer with 32 dB image rejection. The on-chip IF chain, which consists of a VGA, a 2nd mixer and filtering, has a maximum gain of 83 dB, a gain range of 45 dB and a 7 dB NF. A 4-bit ADC is integrated on chip for enhanced SNR. The PLL with its VCO are also integrated. The total NF is 3 dB with a total 121 dB voltage gain. The chip consumes 132 mW at 2.7 V.

F1: Advanced transmitters for wireless infrastructure

Digital cellular standards have emerged over the past 20 years. As a consequence modern cellular handheld radios make use of highly digitized transceiver architectures. This is in contrast to wireless infrastructure systems where nowadays still traditional analog-intensive radio architecture concepts are used, partly owing to more demanding performance requirements. However, future wireless infrastructures will move to more flexible and digitally-intensive architectures to address the increasing number of standards, modes and bands in cellular communication.