  Frequency multipliers, a class of essential electronic components, play a
pivotal role in contemporary signal processing and communication systems. They
serve as crucial building blocks for generating high-frequency signals by
multiplying the frequency of an input signal. However, traditional frequency
multipliers that rely on nonlinear devices often require energy- and
area-consuming filtering and amplification circuits, and emerging designs based
on an ambipolar ferroelectric transistor require costly non-trivial
characteristic tuning or complex technology process. In this paper, we show
that a pair of standard ferroelectric field effect transistors (FeFETs) can be
used to build compact frequency multipliers without aforementioned technology
issues. By leveraging the tunable parabolic shape of the 2FeFET structures'
transfer characteristics, we propose four reconfigurable frequency multipliers,
which can switch between signal transmission and frequency doubling.
Furthermore, based on the 2FeFET structures, we propose four frequency
multipliers that realize triple, quadruple frequency modes, elucidating a
scalable methodology to generate more multiplication harmonics of the input
frequency. Performance metrics such as maximum operating frequency, power,
etc., are evaluated and compared with existing works. We also implement a
practical case of frequency modulation scheme based on the proposed
reconfigurable multipliers without additional devices. Our work provides a
novel path of scalable and reconfigurable frequency multiplier designs based on
devices that have characteristics similar to FeFETs, and show that FeFETs are a
promising candidate for signal processing and communication systems in terms of
maximum operating frequency and power.
