Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
ads agilent snp
1. You can do it either from schematic or data display window. Select "Tools -> Data File Tool" from the menu, a data file window will pop-up; then choose write data file from dataset; specify filename and file format as touchstone; select the dataset you want to export.
2. You...
@DS simulation equation fuction
freq and Z11 are arrays. And Z11=Z(1,1). Z11[0] means Z11[frequnecy_index=0]
So the first equation will give C_Varactor values at frequency index 0, which is, the start frequency of the your simulation. The second equation will return an arrary of C_Varactor...
I checked you ads file. It looks like you were confused by the pin number of the subcircuit. The correct order should be
Symbol pin# Name Subcircuit Name
----------------------------------------------------------------
pin1 in+...
@DS using help
In the case of short circuit model, the RF device will use the input impedance of the next stage as its load.
In the case of open circuit model, the device is isolated from the next stage, however, the signal still goes through. The input impedance of the next stage won't affect...
Maxim has a small device MAX2205/2208 series which can be used for power detect. The PA output signal can go through a 15~20dB directional coupler and then feed into the power detector IC.
You can find S25 service manual
h**p://www.exit99.cz/s25/servis/sm_s25vl2_v11.zip
and repair doc
h**p://www.exit99.cz/s25/servis/sm_c25_lvl_25_v12.zip
Unfortunately, the schematic is missing. One of the above files is encrpyted by MS-WORD, but it can be open as read-only.
Re: gsm-cdma talktime
For CDMA talk time, you can find the formula in CDG-4 document.
I just copy some infor here for calculating current, then you can find the talk time based on the battery capacity.
(1) IS-95
Mobile spends most of its time at an average power of ~-8 dBm for urban and ~-2...
It is very common to clean the copper below the 50ohm trace. For example, 50ohm trace on the top (layer 1), clean the copper on layer 2 just below the trace (not necessary for the whole layer), and make layer 3 as ground. It will result a wider trace which will give lower loss.
agc vs alc
My understanding is that AGC refers to receiver and ALC refers to transmitter.
An AGC amplifier (usually in IF stage) maintains a constant output level while the input receiving signal varies across a very wide dynamic range.
An ALC normally has a known input signal level and it...
wcdma pa
For CDMA cell phone, normally PA_VCC is always on, but TX_VCC is not always ON. According to Qualcomm, two signals, IDLE_N and PA_ON control the power states of the TX circuitry. PA_ON is used to turn on/off the PA and IDLE_N to turn on/off other TX circuitry. PA_ON goes to HIGH...
OscPort
The ADS OscPort model for HB analysis is based on the Nyquist stability test critetion, which is described in "Microwave Transistor Amplifiers, Analysis and Design, 2nd Ed, G. Gonzalez", chapter 5, section 2. The idea is measuring the close-loop gain and phase to determine the...
Pros
1. alleviate LO self-mixing (help DC offset to some extent)
2. resolve LO leakage to antenna problem
3. lower freq VCO and buffer could be realised at lower cost
Cons
1. high order harmonics and mixing products (out-of-band spurs)
2. some circuit architecture may result higher...
If you meant the I/Q gain imbalance and phase imbalance, just inject a single carrier at the RF input and observe the I/Q output with a good digital oscilloscope, which can easily give the gain and phase imbalance readings.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
