A novel method for frequency discriminators construction based on balanced gray code

Abstract

This paper discusses the use of multi-band-stop filters for application as frequency discriminators. A novel design method is presented (multi-band-stop filters based on the balanced gray code) and compared to the straightforward method (traditional gray code). The novel method increases individual rejected bands fractional bandwidth, while assuring that each filter possess the same amount of rejected sub-bands. For a frequency span, it is also shown that the sub-bands fractional bandwidth relative standard deviation is reduced.

Review of microwave frequency measurement circuits

“…In 2016, the balanced Gray code was used instead of the traditional Gray code implementation (shown in fig. 5a) [30]. Using the balanced grey code, sets of filters can be designed using the same amount of rejected sub-bands, while increasing the fractional bandwidth of filters.…”

“…They can be implemented using delay lines [6][7][8][9][10][11][12][13][14][15][16][17][18][19] using planar or coaxial transmission lines, or filters [20][21][22][23][24][25][26][27][28][29]. Discriminators based on filters and delay lines are designed to produce a frequency response associated with Gray's code, obtained after the ACD stage [30].…”

A novel microstrip frequency discriminator for IFM based on balanced gray-code

“…filters). Particularly, the Balanced Gray-code possesses several advantages, which have been identified conceptually in [5]. The work includes an experimental demonstration of the concept.…”