I'm not really familiar with the application the mixer is being suggested for (charge measurement)in the article, however to answer your question about 'heterodyne' mixers, a heterodyne mixer is basically a mixer whose output frequency is at either sum or difference of the local oscillator and input frequency (Fif = Frf +/- Flo). The typical application of mixers in radio applications has historically been in this heterodyne mode. When the local oscillator and the RF signal are at the same frequency the resultant zero frequency (DC) output is commonly used as one type of phase detector where the maximum DC output occurs when the RF and LO signals are in phase quadrature. This is sometimes called homodyne operation. Besides phase detection this zero IF mode is also used in direct conversion receivers. In the past these applications had been typically low performance receivers, however with the development of DSP techniques, the zero IF conversion scheme has become a very important tool. Volumes and volumes have been published on mixers, so the above comments barely scratch the surface of the topic. Ray Anderson Staff SI Engineer Sun Microsystems Inc. Abdulrahman Rafiq wrote: > > This is actually not really a signal integrity question, however I > thought someone here might be able to help me out by explicitly > explaining what is meant by an Hetrodyne Mixer, in general. I have an > idea of what it is, perhaps the term "hetrodyne" is misleading. I tried > looking here for an explaination: http://www.analog-rf.com/mixer.shtml . > > This question is in relation to the following paper: > R.knobel, C.S.Yung, A.N.Cleland Single-electron transistor as a > radio-frequency mixer, Phys Rev. Letters, 81, (2002) > http://www.iquest.ucsb.edu/sites/knobel/mixerset_preprint.pdf > > This particular mixer can be used high-frequency ultrasensitive charge > measurments over a broad and tunable range of of frequencies. > > Thanks in advance for your help > > Regards, > > Abbey > > > ------------------------ > Abdulrahman Rafiq > Graduate Researcher/TA > UC Riverside > EE and Physics Dept. > ------------------------ > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu