A Multi-Band Frequency Synthesizer for DVB-H

作者：Saeedi Saeed^*; Atarodi Mojtaba

来源：International Review of Electrical Engineering, 2009, 4(5): 1110-1116.

• DVB-H
• Frequency Synthesizer
• Multi band
• PLL
• VCO

A fully integrated multi-band frequency synthesizer for Inphase and Quadrature local oscillator signal generation in Digital Video Broadcasting to Handheld receivers is presented. In the proposed I'LL-based integer-N synthesizer, all of the allocated frequencies for DVB tuners, in VHF, UHF and L bands, are generated Two voltage controlled oscillators cover a frequency range of 1880-3632 MHz by using switched-capacitor banks. The VCO frequency is divided by 2, 4 and 16 to generate the quadrature signals at the synthesizer output. A fast adaptive frequency calibration block selects the closest VCO frequency to the target frequency by setting the capacitor bank control code prior to the start of phase lock A programmable charge pump is used to reduce variations in PLL characteristics over the wide frequency range. The synthesizer has been fabricated in a 0.18um CMOS technology and the die area is 2.1 x 1.8 mm(2). It consumes 29mA from a 1.8v power supply. Measurements show that the synthesizer quadrature output phase noise for UHF and VHF bands is lower than -83 dBc/Hz and -133dBc/Hz at 10 kHz and 1.45 MHz offset, respectively.

• 出版日期2009-10