40 Gbit/s/GHz clock recovery and frequency multiplyingAlGaAs/GaAs-HEMT-IC using injection-synchronisednarrowband ring-VCOs and auxiliary PLLs

An IC technique for clock recovery and frequency multiplication was developed by combining a preprocessor, an injection-synchronised narrowband ring voltage controlled oscillator, and a phaselocked loop. A 40 Gbit/s/GHz IC was realised using 0.2 µm GaAs HEMTs. A multiplying factor as high as 64 was reached. The DC consumption is 900 mW.