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transmit return loss
Hi
I have 2 questions about a monostatic (single antenna) UHF RFID system. For example:
(1) If I have an antenna with 20 dB return loss and the output power of the transmitter is 30 dBm, then only +20 dBm will be radiated. If the desired radiation power of the antenna is...
carrier suppression
Hi
In UHF RFID 3 modulation types are used from reader to tag:
SSB-ASK
DSB-ASK
PR-ASK
For SSB a carrier is added, but what about DSB-ASK. When a continuous wave is ASK modulated, two sidebands are created. Is the carrier suppressed in this way, since only the two...
what is a uhf attenuator
Hello
At the moment I'm working as a student on the development of an UHF RFID system for my graduation project. As a reference design I use the "R1000 development kit" from Intel which includes the R1000 transceiver chip. To get more knowledge I studied the...
lc oscillation
Hi all
At the moment I'm designing a CFL ballast, running from a 12V battery. The ballast uses the push-pull topology to create a secondary alternating voltage. With an LC oscillation circuit the CFL is first preheated, then frequency is changed to let LC oscillate to ignite the...
turns ratio calculation centre tapped
I measured the voltages with a oscilloscope. I don't have a lot of exeperience in the field of magnetics, so to understand what I see is sometimes difficult. By stray-inductance you mean the leakage inductance? Can you tell me how to see with the...
transformer winding calculations
I measured the voltage across the two drains and it was 48 Vpp. The voltage on the secondary was 90 Vpp (no load attached). I can't figure out how to get this voltage. I have a turns ratio of 25+25:75, so the voltage transformation must be 3 times.
For...
center tapped transformer
Hi
I have the following circuit of a CFL ballast.
For the design I want to calculate the transformer, but I'm not sure how to do it because of the center tapped configuration. There is a 12V source connected to the center of the primary.
(1)
When I measure the...
CFL ballast HB/PP
Hello
I have the idea to design a battery-operated ballast for a 5W CFL. I made this schematic based on a push-pull topology, but I'm not sure if this topology is the right one for a CFL ballast. In a lot of schematics I see half-bridge designs. Is it better to use this...
cross conduction mosfet
Is it possible to use a half bridge driver IC to drive this push-pull circuit? My idea was to connect the high drive offset voltage to ground and the high/ low drive signal to the gates of the mosfets. A lot of these half bridge IC's have a internal dead time.
push-pull shoot through
Thanks for reply, I know the definition of shoot-through. I was wondering if shoot-through could happen in this push-pull circuit. My thoughts about this is, that if both mosfets conduct at the same time, then the 12V supply will deliver current trough both primary...
cross conduction
Hi
I have the following schematic of a push-pull ballast. I know for a half bridge cross-conduction needs to be avoided, but what about this push-pull circuit. What will happen if the mosfets both conduct at the same moment. The primary coils are wrapped in antiphase. It...
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