Microwave Bandwidth Active Transversal Filter Concept With MESFETs

Active Filters for MMICs

“…These would, however, appear suitable for narrow band applications only. Successful broadband designs have been achieved by employing time-delay filters of the transversal or recursive type [3,4]. Although these concepts are more readily associated with applications im the digital domain, they can be adapted for analogue filter requirements.…”

“…One approach to this problem has been to employ a mathematical substitution which results in one-sign-only coefficients [4]. Another has been to use a distributed amplifier for the [3]. However, the former approach severely deteriorates the transversal response, whilst the latter uses a disproportionate amount of substrate area.…”

Two-tap travelling-wave infinite impulse response filter with 12 dB peaking at 24 GHz

“…The 'travelling-wave filter' architecture was first presented for this purpose in [1] and has recently been applied to the design of integrated circuit equalisers operating at 10s of Gbit/s [2]. Modifications to the architecture have been suggested in [3][4][5], but have always focused on FIR filters.…”

A reconfigurable, multi-gigahertz pulse shaping circuit based on distributed transversal filters

“…Recent research demonstrated that a distributed transversal filter (DTF) can be a good candidate for multi-gigahertz signal processing such as equalization in 10 Gb/s fiber-optic systems [3][4] and sub-nanosecond pulse synthesis [5] . A DTF [6] [7] is essentially an analog transversal filter based on distributed amplifiers [8], which are widely used in microwave communication and radar systems because of their unique wideband characteristics. DTFs are also reconfigurable by controlling the gain from each cell [6].…”