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30 Threads found on Vco And Amplifier
This post was by mistake posted in wrong forum,I am re-posting it here: I have found out experimentally,I need an isolation of better than 80dB between vco and mixer/modulator to avoid vco frequency pulling to a great extent. Is there a simple mathematical equation to find out before hand the isolation value required ?
Hi, I am supposed to design a transmitter for my project. I have already pretty much finished the vco and Power amplifier and now need to build the Mixer. My professor said a Passive Quad-FET would be a good architecture to build. But I am confused on how the schematic for this looks. I keep finding different circuits that (...)
as audioguru said, the purpose of it may vary based on where is implemented (eg. amplifier/DC bias, amplifier matching, vco or others) what type of capacitor it is (tantalum, or ceramic) and configuration (shunt capacitor or series capacitor to ground)
Hi all, I have a vco with a sensitivity of 400MHz/V, and my requirement of frequency sweep is 0 to 150 KHz. How can i use the above component, Is it possible to somehow change the sensitivity of the component by adding additional components ? The specification exactly means that by varying the tuning voltag
Sounds vco Pulling Effect because of Doubler. PLL may not pull-in the carrier in high pulling effects and therefore vco signal can have some ringings about carrier. I guess an isolation amplifier should be used before doubler.
Hello ,, I am designing an integrator using fully differential amplifier in cadence ....i tried modeling the opamp using vco's ....and it worked as an inverting amplifier ...but when replacing the resistor with a cap ...the cct is not working I need help please
for a microwave chip, you want the 100 pf as close as possible, followed by the 100 nf right next to it. The placement of the largest cap is less critical, although if it is a high current device like a transmit amplifier or a low noise device like a vco you would want the big one close by also.
I think they just add linearly in power. Assuming the two were uncorrelated, if vco had a phase noise of -20 dBc/Hz at 1 KHz offset, and amplifier had -30 dBc/Hz at 1 KHz offset, P = 0.01 + 0.001 = 0.011 which would look like -19.586 dBc/Hz at 1 KHz offset for the series combination of vco and (...)
Hello! I've plotted vco spectrum in rad^2/Hz. Now i have to apply amplifier noise and mixer noise. I have NF(db) and Gain(dBm) from datasheets. How can i apply it ? Can just summarize as vco+ampNF-Gain etc. ? I am really lost with all these parametrs... any help will be very appreciated.
Hi Guys, I am simulating a vco with the following design: Process: 0.18 um Tool: Cadence Spectre Topology:Three stage Differential amplifier (with symmetric load) Supply: 3.3V Frequency: 2.4GHz I measured the phase noise and it was -100 dbc/Hz at 10 MHz. Is this a good performance? I am using a DC control voltage of about 875 (...)
All passive and active components contribute to the phase noise of the system. If the phase noise of a component is close to the thermal power level, this will be degraded and there is no method to correct the situation. Unlike measuring phase noise in a vco, amplifiers require a much more sensitive measuring system (...)
Use a buffer amplifier after the vco, to boost the generated signal.
One option is to add preamplifier/mixer, based on a dual-gate MOSFET, and a vco .. Depending on the frequency range of the vco, you will be able to receive almost "anything" you like .. Here are examples of pre-amplifier(BF990) and vco(BB149): Regards, IanP
What happens to the frequency of oscillation of a ring oscillator if I increase the gain of each amplifier stage above the minimum required gain levels? Would the frequency increase or decrease? I would definitely prefer a time-domain explanation.
buffer stage is to convert the output signal from the vco core to a rail-to-rail switching signal . This can be achieved by the use of a two-stage active current mirror makes the input stage, which serves both as a differential to single-ended converter and an amplifier. second stage the inverter is designed to make the output signal ful
Hello, When I design a vco followeb by an amplifier stage, Should I match between them whatever is the frquency? Or this will change the oscillation frequency? I though in that, but if anyone tried it or have previous info about it, then tell me Regards, Ahmad,
There are several possible things. For low temperature, the amplifier in the feedback loop misfunctions. Monitor the voltage to the vco control input. Also try characterizing the vco by itself at the low temperature. Measure the frequency for different control voltages at room temperature and at -40. The vibration (...)
The mute circuit disables the audio output for situations when a station is not tuned in properly. A frequency locked loop measures the frequency of the vco in some way and adjusts the frequency to be some set value. Another way is to measure the received signal frequency in the IF amplifier stages and adjust the (...)
Why don't you use emitter follower to buffer your signal?? Or if you tech. is proper source follower ??? Generally we use either emitter follower or Cherry-Hooper limiting amplifier to buffer the vco signals and in measurements we obtain -141dBm/Hz @ 4.6MHz.. Think that...
Hello, Does anyone here knows a good site for learning system design? What I mean is, all the books tells you how to design mixers, amplifiers, lna's and vco's, but I never encoutered a site which tells you in the system manner For example, power management - can we share one voltage regulator to amplifier (...)