EMRFD Message Archive 5436

Message	Date	From	Subject
5436	2010-11-19 08:11:55	Alberto I2PHD	Differential to Single-Ended
I am trying to design a differential to single-ended circuit, to be used in an active antenna (a mega loop) project. I received an advice about using a Norton current mirror in a differential amplifier. I tried to simulate that with PSpice, but the results were horrible... can please somebody shed some light on the errors I made in the circuit ? Many thanks http://www.sdradio.eu/images/diff2single.gif -- /*73 Alberto I2PHD*/ [Non-text portions of this message have been removed]
5437	2010-11-19 08:18:59	Roelof Bakker	Re: Differential to Single-Ended
Hello Alberto, Have you been looking into this one: http://www.lz1aq.signacor.com/docs/wsml/wideband-active-sm-loop-antenna.htm If it is not what you need, it still is a good read on the subject! 73, Roelof, pa0rdt
5438	2010-11-19 08:37:27	Alberto I2PHD	Re: Differential to Single-Ended
5439	2010-11-19 08:57:14	w4zcb	Re: Differential to Single-Ended
I've had excellent results with a simple instrumentation amplifier made with LM833 operational amps. Set for ~60 dB of gain. W4ZCB >> Have you been looking into this one: >> >> http://www.lz1aq.signacor.com/docs/wsml/wideband-active-sm-loop-antenna.htm >> >> If it is not what you need, it still is a good read on the subject! > Hi Roelof, > > thanks for that pointer, it looks quite interesting. However that > schematic makes use of transformers, which I would > like > to avoid, as my design should work from extremely low frequencies (5 > kHz) up to not more than 500 kHz.
5440	2010-11-19 09:45:14	Alberto I2PHD	Re: Differential to Single-Ended