Low Power 1 GHz Frequency Synthesizer LSI's

To realize a low-power low-cost highly-reliable frequency synthesizer for a 1 GHz band radio, a bipolar presealer IC, and a CMOS LSI, consisting of a programmable counter, phase frequency comparator, and fixed divider, have been developed. The PLL synthesizer principle, using a pulse swallow counter, has been adopted for 1 GHz direct programmable count down. Adopting an advanced bipolar process and a diode AND circuit for the dual modulus presealer IC, high frequency operation at 1 GHz and 150 mW low power dissipation have been achieved simultaneously. To reduce the loop delay in the CMOS programmable counter, which limits the operating frequency, a new circuit configuration for the programmable counter and pulse swallow counter is adopted. As a result, 1 GHz frequency synthesizer LSI's have been developed with 150 mW low power dissipation for the presealer IC and 18 mW low power dissipation for CMOS LSI.