RF frequency divider - Page 1
Forum section: electronics / rf-microwave

author: Sariel
author_rank: Regular Contributor
timestamp: August 09, 2024, 03:01:22 pm
content: Hey,I am looking for some material:Schematic, book chapter,good practical paper about how to build a RF frequency divider.It is easy to divide frequency in digital electronics for rectangular waveform. But I want to build a circuit to divide the frequency (without doing downconversion using a mixer). Just an opposite circuit to the typical multiplier circuit.I would probably try this first in the VHF band, as parasitic will be easier to overcome and measurements easy to conduct.

author: vk4ffab
author_rank: Frequent Contributor
timestamp: August 09, 2024, 10:04:15 pm
content: Quote from: Sariel on August 09, 2024, 03:01:22 pmdepending on the resolution you want, you can divide by 2, 4 etc by using a couple of flip flops, you can use a PLL or there are dedicated divider IC's which are just a selection of gates and flip flops you can switch on and off like the SN74LS29. Drop your design frequency a lot and you can do frequency division with a 555 IC. The what and how depends on your application, but, with a single D flip flop IC you should be able to divide up your VHF input to something much smaller in about 5 mins on a bread board. Its the heart of a lot of home brew receivers needing a quadrature IF.https://www.electronics-tutorials.ws/counter/count_1.html

author: RFDx
author_rank: Regular Contributor
timestamp: August 10, 2024, 10:34:00 am
content: Quote from: Sariel on August 09, 2024, 03:01:22 pmSearch for "regenerative frequency divider". A few examples:http://www.ke5fx.com/regen.htmhttps://tf.nist.gov/general/pdf/2609.pdfhttps://csaavedra.net/papers/conferences/2011-NORCHIP-divide-by-3.pdfhttps://ieeexplore.ieee.org/document/6243683http://www.timeok.it/wp-content/uploads/2015/08/low-noise-regenerative-divider1.pdf

author: 807
author_rank: Frequent Contributor
timestamp: August 11, 2024, 12:18:56 pm
content: Are you looking to just halve the frequency, or do you want to divide by 4, 8, 16 etc. or divide by some odd numbers?

author: Sariel
author_rank: Regular Contributor
timestamp: August 11, 2024, 03:07:55 pm
content: I am looking both for odd and even divisions.

author: Sariel
author_rank: Regular Contributor
timestamp: August 11, 2024, 03:10:16 pm
content: This is probably the circuit.How popular and used is this method?Are such circuits used as prescalers in commercial test equipment?Can such circuits be simulated in ADS, just by using s paramters? Frequency domain? Or time domain simulations are needed to simulate correctly the feedback loop?

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: August 12, 2024, 08:37:50 pm
content: Quote from: Sariel on August 11, 2024, 03:10:16 pmYou can't use S parameters because the transistors are behaving very non-linearly. You can tell because new frequencies are being generated (specifically half the input frequency), while with S parameters we assume that everything is linear and no new frequencies are created. You will have to do time domain simulation.Is there a reason why the MC12093 (or something similar) won't work?