Study Of Low Loss Substrate In Mixer Signals Integrate Circuit

With the development of design and manufacture level in integrate circuit; the demand for level of circuit integrated and loss are increased. For achieve high integration, portability, low loss and low cost in integrate circuit, a mixer-signal integrate circuit is introduced. Loss of silicon substrate is very high in GHZ frequency, noise coupling serious in substrate, unsuitab apply in mixer-signal integrates circuit system. Now, the substrate material of mixer-signal integrate circuit are quartz, GaAs and so on, for the high cost and not compatible with standard CMOS techniques, would not satisfy the demand for the development of mixer-signal integrate circuit.In the paper, consider the loss, cost and compatible with standard CMOS techniques, select porous silicon (PS) and silicon on insulator (SOI) for mixer-signal integrate circuit new substrate material. Use Ansoft HFSS and ADS modeling and simulated. The main work are:1. Compare the low loss substrate, PS, HRS and SOI combining with passive device analyze the infection of substrate material from loss and Q factor.2. Take CPW (coplanar wave-guide), analyze the infection of temperature and distributing of electromagnetic field for loss. Compare the coupling of substrate material of filter, use PS displace Al₂O₃, prove that new substrate material could not only improve the performance of passive device, but also could improved the integration of the device.3. Compare the isolation of substrate material of filter, using PS displace MgO, more, build up a mixer-signal integrate circuit system, analyze the infection of substrate material for gain of system and noise coefficient, prove that substrate material could not only improved the performance of passive device, but also could improved the integration of the circuit, restrain the noise coupling, adapt to the development of mixer-signal integrate circuit. Validated the advantages of those substrate material in mixer-signal integrate circuit and feasible in device and system in theoretic.