A high speed voltage-controlled oscillator (VCO) has been developed using 50 GHz GaAdAICaAs HBTs which can generate differential signals in the range of 0.25-20 GHzThe design process was focused on producing a layout with highly-matched parasitic capacitance by exploiting the high degree of symmetry present in differential circuits. The system design and cell layout techniques are described in detail using examples from the VCO. The operation of the VCO is also discussed along with design tradeoffs.
The required features of SerDes chips for 100Gbps Ethernet and OTN optical data transmission are discussed. As a baseline technology for 100Gbps SerDes, 40Gbps DPQSK serializer chip performance is presented.(
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