Hanes, "2-20-GHz GaAs Traveling-wave Amplifier
," IEEE Transactions on Microwave Theory and Techniques, Vol.
Ayasli, et al., "A Monolithie GaAs 1-13 GHz Traveling-wave Amplifier
," IEEE Transactions on Microwave Theory and Techniques.
The iT2007 GaAs MMIC traveling-wave amplifier
chip has the broadest bandwidth of the two, and can achieve a power-added efficiency (PAE) greater than 12 percent up to 12 GHz and greater than 10 percent up to 18 GHz.
Kaman, "A 100 kHz to 50 GHz Traveling-wave Amplifier
IC Module," IEEE Microwave and Guided Wave Letters, Vol.
To date, both the negative feedback and traveling-wave amplifier concepts have been limited to broadband amplifier designs only.
At present, traveling-wave amplifiers are employed extensively in the design of broadband amplifiers operating over the bandwidth of 2 to 18 GHz.
Figure 14 shows the state-of-the-art monolithically integrated PIN photoreceivers to date.(22-25) A record monolithic photoreceiver bandwidth of 27 GHz has been achieved using InAlAs/InGaAs heterostructure FETs (HFET) and a distributed traveling-wave amplifier approach.(24)
In particular, the use of a microwave distributed transmission line approach such as that found in distributed traveling-wave amplifiers enables the designer to fully exploit the device performance without incurring degradation due to interconnect and device parasitic effects.(14)
Hanes, "2-20 GHz GaAs Traveling-Wave Amplifier
," IEEE Trans.
Figure 2 displays the drain voltages for four of the seven stages of the traveling-wave amplifier
. The +40 dBm input drive level causes a high level of harmonic distortion, as is evident in the time domain information.
Levush, "Stability of traveling-wave amplifiers
with reflections," IEEE Transactions on Plasma Science, Vol.
are an example of performance available through integration that cannot be matched in hybird technology.