- Subharmonic mixer
Whereas in a "fundamental"
frequency mixerthe output frequency () contains the sum and difference of the fundamental tones of the two input signals ( or ), in a subharmonic mixer the output signal is the sum and difference of the fundamental and one of the "harmonics" of the two input signals such as: , . Subharmonic mixers are often used in direct-digital, or zero IF, communications system in order to eliminate the unwanted effects of LO self-mixing which occurs in many fundamental frequency mixers.
A subharmonic mixer that has two switching stages is used to improved mixer gain in a direct downconversion receiver. The first switching stage mixes a received RF signal to an intermediate frequency that is one-half the received RF signal frequency. The second switching stage mixes the intermediate frequency to baseband. By connecting the two switching stages in series, current is reused and harmonic content from the first stage is fed into the second stage thereby improving the mixer gain.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Subharmonic — frequencies are frequencies below the fundamental frequency of an oscillator in a ratio of 1/x. For example, if the fundamental frequency of an oscillator is 440 Hz, sub harmonics include 220 Hz (1/2) and 110 Hz (1/4).Subharmonics can be produced … Wikipedia
Frequency mixer — This article is about non linear mixing operating in the frequency domain. For other types of mixers, see electronic mixer. Frequency Mixer Symbol. In electronics a mixer or frequency mixer is a nonlinear electrical circuit that creates new… … Wikipedia
Dreamatorium — Studio album by Death Cube K Released May 13, 1994 … Wikipedia
Disc jockey — DJ and DJs redirect here. For other uses, see DJ (disambiguation) and DJs (disambiguation). Club Eifel s DJ Blaze performing at the 2009 Air Force Ball. A disc jockey, also known as DJ, is a person who selects and plays recorded music for an… … Wikipedia
Bill Laswell — Infobox musical artist Name = Bill Laswell Img capt = Bill Laswell at Moers Festival 2006, Germany Img size = Landscape = Background = non vocal instrumentalist Birth name = Alias = Born = Birth date and age|1955|2|12|mf=y Salem, Illinois, U.S.… … Wikipedia
Material (band) — Material Genres Experimental rock Post disco Years active 1979–present Labels ZE Records, Axiom, Celluloid Records Associated acts … Wikipedia
New Amerykah Part One (4th World War) — Studio album by Erykah Badu Released February … Wikipedia
Disembodied (Buckethead album) — Disembodied Studio album by Death Cube K Released July 22, 1997 … Wikipedia
Material discography — Material discography Releases ↙Studio albums 6 ↙Live albums 2 … Wikipedia
Memory Serves — Studio album by Material Released 1981 … Wikipedia