SLA Information

SLA Status	Assignee	Support Status
SLA Closed. Met after 0 hours	emrecangidik	Closed

Products Mentioned

ADF4158 Recommended for New Designs
The ADF4158 is a 6.1 GHz, fractional-N frequency synthesizer with modulation and waveform generation capability. It contains a 25-bit fixed modulus, allowing...
Datasheet
ADF4158 on Analog.com

Thread Details

State Not Answered
Replies 2 replies
Subscribers 69 subscribers
Views 344 views
Users 0 members are here

Is it Possible to achieve this requirements in this IC

AvGarde on Aug 18, 2025

Thread Summary

The user inquires about the feasibility of sweeping 150 MHz in 0.1 μs using Analog PLLs in a Ramp Up-Down configuration. The final answer suggests that 100 ns is a very fast ramp time and recommends using ADISimPLL to simulate and investigate the ramp profiles. The solution emphasizes the need for high resolution and linearity in ramping, and mentions the importance of a wider frequency modulation bandwidth for maintaining gain flatness across the spectrum.
AI Generated Content

Category: Hardware

Product Number: ADF4158

The key performance requirements are:
Frequency sweep 1 (in Ramp Up-Down configuration):
Start: 2.4 GHz
Stop: 2.485 GHz
Sweep time/sweep rate: 0.1 μs/ 10 MHz

Frequency sweep 2 (in Ramp Up-Down configuration):

Start: 5.725 GHz
Stop: 5.85 GHz
Sweep time/sweep rate: 0.1 μs/ 10 MHz

is it Possible to sweep 150MHz in 0.1us
Additional requirements:
Wider Frequency modulation bandwidth for maintaining gain flatness across the sept band
High resolution and linearity in ramping

emrecangidik

on Aug 18, 2025 2:22 AM
0
Hi,

100ns is quite a fast ramp time to achieve with Analog PLLs. ADISimPLL can help you simulate ramp profiles. You can investigate whether your requirements can be met using ADISimPLL.

http://www.analog.com/en/education/education-library/videos/1846356091001.html
Thanks,
Emrecan
Cancel
Up +1 Down

Verify Answer

Cancel
AvGarde on Aug 19, 2025 2:07 AM
0

Hi,

I have tried simulating ramp profile results are

but the Vco suggested by ADISimPLL is HMC385LP4

I tried an experiment with the VCO by Giving a V tune from a AWG with
Frequency sweep (in Ramp Up-Down configuration):
Start: 2.4 GHz
Stop: 2.485 GHz
Sweep time/sweep rate: 1 μs/ 1 MHz

But I am unable to get gain flatness across the sept band as show in Figure below there is a difference of almost 4.3 dB in swept band give me a better VCO option which can used for this condition

Can u suggest me VCO which can cope up with this sweep rate
And what should be the Parameter or capabilities of the which can handle such high rates
Cancel
Up 0 Down

Verify Answer

Cancel