A Wideband TIA-Driver Unit in 22-nm CMOS FDSOI for Integrated Microwave Optoelectronic Oscillators

This paper presents the design and measurement results of a cascaded transimpedance amplifier (TIA)-driver unit in <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$22-\text{nm}$</tex> CMOS FDSOI technology as part of a potential integrated microwave optoelectronic oscillator (OEO). The TIA utilizes three-cascaded stages of inverter-based units to increase its gain via composite transistors and reduce its power supply via current reusing while the driver is based on a 3-stacked amplifier stage with resistive feedback to increase the output swing and maintaining the amplifier stability. Measurement results show the TIA-driver unit achieves a voltage gain of 35-39 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$d B$</tex>, noise figure of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$6.5 d B$</tex> and a group delay of 50-100 ps over the 2-13 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$G H z$</tex> bandwidth. It has an output voltage swing of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\sim 1.5 V$</tex> for an input TIA current of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$300 u A$</tex>, suitable to drive a silicon photonic Mach-Zehnder modulator (MZM) as part of an integrated microwave OEO. The chip occupies an area of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$0.918 ~\text{mm}^{2}$</tex> and consumes 225 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$mW$</tex> using a 0.8 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$V$</tex> and 2.5 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$V$</tex> supply voltage for TIA and driver, respectively.