Ultrafast clock and carrier recovery with amplified loop and saw filter at 1.25 GHz

An ultrafast circuit for clock and carrier recovery in the microwave frequency range is presented. The circuit consists of a feedback loop amplifier with quadrate‐balanced amplification. It was fabricated on a common FR‐4 substrate, using only commercial surface mount devices components and having a surface acoustic wave filter as the resonant element. The basic feedback circuit was simulated and also realized. Experimental results demonstrate the clock recovery of a Gigabit Ethernet connection and the carrier recovery of a frequency modulation signal. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2929–2933, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24766