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A wideband RC polyphase network for quadrature signal generation is presented. A new approach based on a feedback calibration mechanism that capacitors are tuned according to the mismatch in amplitude of quadrature signals is proposed. The architecture is applied in an IEEE 802.11a quadrature signal generation circuit with a centre frequency of 5.5 GHz and a bandwidth of 1.8 GHz. This circuit is implemented...
A simple optical pulse generator based on a semiconductor optical amplifier (SOA) is demonstrated with an easy-generated external optical pulse sequence. Using the cross-gain modulation and self-phase modulation effects inside an SOA, the simple optical pulse generator generates a 10 GHz 3.8 ps optical pulse train with an extremely low timing jitter of 60 fs.
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