- BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE HOW TO
- BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE FULL
- BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE FREE
The peak power is the signal power during the pulse. Duty factor can be expressed in decibels as well as percent a 10% duty factor is -10 dB.Ī square-wave pulsed RF signal is a special case in which the RF signal is on and off for the same duration of the period. A 100% duty factor implies that you have a continuous wave signal. The duty factor is the time that the pulse is on, divided by the period.
The pulse width is the length of time that the RF is switched on in one pulse period. It is the reciprocal of the pulse period.
BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE FULL
The pulse repetition frequency (PRF) is the same as the repetition rate (aka rep rate) and is the frequency that the signal is turned on and off through a full cycle, measured in Hertz. Pulse fall time likewise is the time from 90% to 10%. Pulse rise time is the time needed for the pulse envelope to pass two conditions, such as 10% of final value to 90% of final value. The pulse envelope is the shape of the RF pulse after it has been transformed through a detector circuit. The word "video" here was adopted from television, where the video signal (the picture) is carried on a VHF or UHF signal. The video input terminal of a modulator is the signal that causes the RF waveform to switch. A pulsed RF signal is periodic in that is has two distinct and recurring states the on state state provides a stable medium or high power signal, the off state has much reduced signal strength (ideally no signal is present in the off state). We also have a pretty good page on microwave switches.Ĭreating pulsed waveforms using an amplifierīuilding a breadboard pulsed source (separate page) Some definitionsįirst, here are some definitions that have to do with pulsed RF.Ī continuous wave signal is an RF signal that maintains full power, i.e. If this topic interests you, also see our page on oscilloscope measurements. Maybe someday we will deal with a more complicated modulation scheme.
BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE HOW TO
In our first example we will show you how to create a pulsed signal using an RF amplifier.įor now we will assume that only rectangular pulsed waves are desired, that no amplitude modulation or pulse-width modulation are required. One is to use an RF switch, the other is to use a pulsed RF amplifier. There are two easy ways to create a pulsed signal from a CW signal. This page came about through some conversations with a Stanford University student who was is need of a laboratory setup for pulsed RF measurements, and has grown due to popular demand! Build the breadboard drain-pulsed amplifier described on a separate page and you will have a useful piece of test equipment for your microwave laboratory, for very little cash, you cheapskate! Read this tutorial to get some basic knowledge about how pulsed signals can be obtained in the laboratory, as well as in real systems.
Pulsed RF is important in radar as well as communications applications.
BIPOLAR SQUARE WAVE TO TWO LEVEL SQUARE WAVE FREE
We've split off a full page on building a breadboard RF modulator using a free Hittite amplifier, with contributions from some people at NASA! Click here to check it out!
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