Distributed Transmission Line, Characteristic Impedance in AWR Microwave Office
Distributed Amps the way you built should be ringing, in theory as well as in practice. To get them to work without ringing, you need an "m-derived network." old Tek manuals from the vacuum tube era show how.

For example, see here http://w140.com/tekwiki/images/3/36/545a_vert.png

the center-tapped inductors are key. Google "t coil network" or "m derived network" for the design equations.



i refer to any of the tapped inductors in the tektronix schematic. for an impedance of Z=1 and a fet capacitance of C=1, we need each half of the inductance to be 1/3 and the mutual inductance to be m=1/2. that gives a 3 db bandwidth of B=2.7 and rise time tr=.79. In theory, a capacitance of C/12 from end to end of the tapped inductor is understood.

so if, for example, Z=50R and C=1.5pF, we get an inductance of 1.25 nH, m=1.875 nH, B=5.7 GHz and tr= 59 ps. Overshoot is less than a percent.