This brief presents a novel wide-bandwidth second-order voltage-mode all-pass filter derived from a canonical single transistor bandpass filter. The core of the circuit consists of only one transistor, two resistors, and two energy storage elements. The operation of the proposed filter is validated experimentally. A filter implemented in an IBM 0.13-    $\mu\mbox{m}$   CMOS was measured to have a 55-ps group delay across a 6-GHz bandwidth while consuming 18.5 mW from a 1.5-V supply. This work experimentally demonstrates a CMOS all-pass filter that operates at multigigahertz frequencies and achieves the highest delay-bandwidth product compared to previously published CMOS all-pass filters known to the authors.
['Peyman Ahmadi', 'Brent Maundy', 'Ahmed S. Elwakil', 'Leonid Belostotski', 'Arjuna Madanayake']
A New Second-Order All-Pass Filter in 130-nm CMOS