Forum
Forum
Verilog-AMS
Analysis
Modeling
Design
Theory
Welcome, Guest. Please
Login
or
Register.
Please follow the Forum
guidelines
.
Sep 26
th
, 2024, 2:41pm
Home
Help
Search
Login
Register
PM to admin
The Designer's Guide Community Forum
›
Simulators
›
System Simulators
› Bandpass sampling
‹
Previous topic
|
Next topic
›
Pages: 1
Bandpass sampling (Read 286 times)
Mahyar
New Member
Offline
Posts: 7
Bandpass sampling
Apr 02
nd
, 2009, 1:59pm
Hi guys,
For my master thesis I need to model and design a uniform quadrature bandpass sampling (UQBS) circuit. Do you have any good reference. specially for modeling the system in MATLAB and implementation.
regards,
M
Back to top
IP Logged
pancho_hideboo
Senior Fellow
Offline
Posts: 1424
Real Homeless
Re: Bandpass sampling
Reply #1 -
Apr 11
th
, 2009, 3:50am
Mahyar wrote
on Apr 2
nd
, 2009, 1:59pm:
For my master thesis I need to model and design a uniform quadrature bandpass sampling (UQBS) circuit.
Do you have any good reference. specially for modeling the system in MATLAB and implementation.
What is UQBS ?
What is different from conventional qudrature bandpass sampling ?
Uniform sampling is common although theoretically non-uniform sampling is possible.
Your sampling is nyquist-sampling(over sampling) or under-sampling of bandpass signal ?
Back to top
Kita━━━━━━(゚∀゚)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related
IP Logged
Mahyar
New Member
Offline
Posts: 7
Re: Bandpass sampling
Reply #2 -
Apr 11
th
, 2009, 5:03am
UQBPS is the uniform quadrature bandpass sampling which is the same as conventional quadrature bandpass sampling but since it is uniform it is easier to be realized as the implementation point of view. For sure it is an under sampling system since it wants to be a solution for software defined radio and the aim is to relax the requirements on ADC e.g high sampling rate.
At the moment I have two basic questions to ask:
1- How to express and show a single sideband bandpass signal in MATLAB.
2- I have the transfer function of a complex FIR filter and the coefficients but I don't know how to express it in MATLAB and see its response to my single sideband signal.
Thanks,
Mahyar
Back to top
IP Logged
pancho_hideboo
Senior Fellow
Offline
Posts: 1424
Real Homeless
Re: Bandpass sampling
Reply #3 -
Apr 11
th
, 2009, 5:21am
MATLAB are different from Simulink.
Do you intend to mean MATLAB not Simulink ?
The followings are general notes.
- Use correct terminologies.
- Warnigns are different from Errors.
- ADS is not name of simulator.
- There is no tool which name is Cadence.
- All gains in Direct Plot of Cadence ADE are "right", "true" and "practical" voltage gain.
- MATLAB are different from Simulink.
- Learn measurements using actual instruments. Not "EDA Tool Play".
Mahyar wrote
on Apr 11
th
, 2009, 5:03am:
1- How to express and show a single sideband bandpass signal in MATLAB.
2- I have the transfer function of a complex FIR filter and the coefficients but I don't know how to express it in MATLAB and see its response to my single sideband signal.
Which of model in the followings do you use ?
(1)Real RF Signal, (I(t)+j*Q(t))*exp(j*omega0*t)
(2)Equivalent Lowpass Representation of RF Signal, {I(t)+j*Q(t), omega0}
http://www.designers-guide.org/Forum/YaBB.pl?num=1233929450/1#1
In your case, you have to use (1).
Attached figure is a conventional quadrature bandpass signal sampling using a single sampler.
Here you can't get I and Q at same time. Time difference of Ts always exists.
See the followings.
http://en.wikipedia.org/wiki/Digital_down_converter
page.14-16 of
http://cp.literature.agilent.com/litweb/pdf/5989-9003EN.pdf
http://www.mathworks.com/applications/dsp_comm/demos.html?file=/products/demos/s...
http://www.altera.com/support/examples/dsp-builder/exm-digital-down-conv-cic-fir...
Which do you use single or dual sampler ?
What effects do you want to focus on in modeling quadrature sampler using Simulink ?
Multiple folding noise ?
Effect of Sampling Jitter in under-sampling system ?
If you only have interest on complex FIR, you don't have to model quadrature sampling at all.
Just create analytic signal representation of real signal.
Also see
http://www.designers-guide.org/Forum/YaBB.pl?num=1207225157
Back to top
boke_002.jpg
«
Last Edit: Apr 12
th
, 2009, 5:02am by pancho_hideboo
»
Kita━━━━━━(゚∀゚)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related
IP Logged
Pages: 1
‹
Previous topic
|
Next topic
›
Forum Jump »
» 10 most recent Posts
» 10 most recent Topics
Design
- RF Design
- Analog Design
- Mixed-Signal Design
- High-Speed I/O Design
- High-Power Design
- Mixed-Technology Design
Analog Verification
- Analog Functional Verification
- Analog Performance Verification
Measurements
- RF Measurements
- Phase Noise and Jitter Measurements
- Other Measurements
Modeling
- Semiconductor Devices
- Passive Devices
- Behavioral Models
- Transmission Lines and Other Distributed Devices
Design Languages
- Verilog-AMS
- VHDL-AMS
Simulators
- Circuit Simulators
- RF Simulators
- AMS Simulators
- Timing Simulators
»» System Simulators
- Logic Simulators
Other CAD Tools
- Entry Tools
- Physical Verification, Extraction and Analysis
- Unmet Needs in Analog CAD
General
- Tech Talk
- News
- Comments and Suggestions
- Opportunities
« Home
‹ Board
The Designer's Guide Community Forum
» Powered by
YaBB 2.2.2
!
YaBB
© 2000-2008. All Rights Reserved.
Copyright 2002-2024
Designer’s Guide Consulting, Inc.
Designer’s Guide
® is a registered trademark of
Designer’s Guide Consulting, Inc.
All rights reserved.
Send comments or questions to
editor@designers-guide.org
. Consider
submitting
a paper or model.