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This paper presents the new Passive Radar and Signal Intelligence signal chain possibilities that are created by the latest 12-bit 4.5GSPS ADC development. It focuses on a new high speed, high resolution Analog to Digital Converter (ADC) with high input bandwidth which enables the direct RF down conversion up to S-band. It allows new perspectives for application such as Passive Radar and Signals Intelligence.

This paper describes design techniques for Bipolar and BiCMOS analog circuits. Comparison on such performances as transconductance, speed, matching, noise of bipolar and CMOS transistors are reviewed and compared. Design achievements such as a single core 12 Bit 1.5GS/s Analog to Digital Converter (ADC) [1] and a single core 12 Bit 3GS/s Digital to Analog Converters (DAC) [2] based on a fully bipolar 200GHz SiGeC technology are introduced to illustrate the advantages and drawbacks of a fully bipolar technology for high speed data converters. A Quad 10 Bit 5GS/s ADC based on 4 interleaved ADC Core designed with a 120 GHz 0.18um BiCMOS technology is also presented, to illustrate the advantages brought by the combination of Bipolar and CMOS technologies.

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