The 'leakage' you're addressing most likely *isn't* capable of directly affecting other devices, but, rather would cause, say, a nasty herring bone on a CH 2 TV signal. Direct rectification of signal at junction requires that the jucntion see a voltage at least sufficient to shift the Q point and either turn off (bipolar device) or turn on and that requires in the neighbor hood of .65V. Even for a milivolt sensitive op-amp - it still requires that the applied errant RF signal affect the cirtcuit's BIAS point (assuming the RF signal is much above the upper bandwidth of the op-amp) by rectification of the applied hi-frequency AC (RF) signal). By spreading this 'tone' (as we in the RF field are prone to term them) over a much wider range a barely perceptable effect might be the result. This is a far cry better effect than a noticible 'herring bone' appearing on a TV set. Bear in mind that a signal (tone) 40 dB down from a TV station's carrier can be evident on a TV screen ... Jim ----- Original Message ----- From: "Douglas Butler" To: Sent: Monday, April 15, 2002 9:16 AM Subject: Re: [OT]:Spread Spectrum Efficiency for Continuous signals > The point is that the amplitude of each cycle is the same whether it is > at the 60MHz nominal frequency, or if this particular cycle is shifted > to 61MHz. It is only when the spectrum is averaged over time that the > signal amplitude appears lower. If you do a spectrum analysis of any > single cycle of a SS modulated clock, it amplitude will be almost > exactly the same as a cycle of unmodulated clock. When the signal self > mixes it is mixing with itself. It is not mixing with an average cycle. > So the amplitude of the individual cycles is what matters. This mixing > produces a difference signal which is DC which disrupts low frequency > legitimate signals the amplifier is supposed to handle. > > Sherpa Doug > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body