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RF mixer

Radio frequency (RF) mixers, also referred to as modulators, are used to up convert an IF input signal having an intermediate frequency to a desired output signal having an radio frequency (IF). Radio receivers typically receive a radio frequency signal and downconvert it to a signal having a lower frequency, which is easier to amplify, filter and process. This is usually accomplished in a mixer that mixes the RF signal with local oscillating (LO) signal having a different frequency. The RF mixer then outputs an intermediate frequency (IF) signal that is further processed by the receiver. RF mixers combine the IF input signal with a local oscillator (LO) signal at an LO frequency to produce an output signal with an RF equal to the sum or the difference of the LO and IF frequencies. The function of a mixing circuit is to combine signals of two different frequencies in such a way as to produce energy at other frequencies. This function is typically achieved by designing a circuit that receives two input signals and produces an output that is product of the two inputs. Mixers are used in transceivers in many commercial wireless applications, including wireless local area networks (LANs), wireless personal communication devices including radios, cellular phones, cordless telephones, personal digital assistants (PDAs), PCMCIA computer interface applications, telemetry systems, global positioning systems (GPS) and other radio frequency (RF) devices.

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