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Some common terminology used to specify a mixer: Conversion compression Specification that indicates the maximum value of the input RF signal level that will obtain a linear increase in IF output power For example, Level 7 DBM mixers will usually have a conversion compression of +2 dBm Conversion loss The rated signal level difference between the input and the output of a mixer at the rated LO input power For instance, a Level 7 (+7 dBm LO drive) DBM mixer may have a loss in power from the input to the output of 8 dB at midband Cross modulation Describes the undesired transfer of the modulation between a modulated and a CW signal within the mixer stage High-side injection When the LO frequency is higher than the RF frequency in a mixer stage Intercept point Superior two-tone third-order product suppression demands a high mixer intercept point This value is approximately 10 dB higher at the mixer s input than the conversion compression rating discussed above The cross modulation distortion and desensitization are also reduced with a high intercept point Interport isolation The rating of the feedthrough between the mixer s LO, RF, and IF ports This is the value, in dB, that one port s signal is attenuated at another port s input or output The most important of these isolation specifications is the LO attenuation at the IF and RF ports, since LO feedthrough is a major problem in receiver and transmitter system s design, and the RF to LO isolation is normally of little concern due to the RF s low input levels Typical mixer LO to IF isolation will range from 0 to 50 dB, depending on topology and port filtering Low-side injection When the LO frequency is lower than the incoming RF frequency in a mixer stage Noise figure (NF) The noise added by the mixer itself, and equals the difference between the noise at the input of the mixer and the output of the mixer, in dB When the mixer is driven with the proper LO drive level, the NF will equal the conversion loss
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72 Active Mixers
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Active mixers vary from the passive-type diode mixers described above Active mixers can supply a conversion gain instead of a loss, they require far less LO drive power, are much less sensitive to port terminations, have better ultimate LO-to-IF isolation, and produce less mixer spurs However, wider adoption of certain active mixers, such as the Gilbert cell type, has been somewhat hindered by a poor IP3, high NF (around 15 dB), and the need for a DC supply voltage In many high-end wireless applications, the first two problems have limited the active mixer s role to the later stages of a receiver, where the dynamic range of the signal is more under control by the AGC, and the NF matters little Many active mixers work by exploiting the high-level signal that is produced by the radio s LO to force the mixer s transistor to operate within its nonlinear region,
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functioning only during a 180 of its conduction cycle (similar to a Class C amplifier), while the much smaller in amplitude RF signal operates within the active device s linear region And even though the mixer is built for nonlinearity, it still acts as a far from perfect, but nondistorting, linear frequency shifter (when not overdriven by the RF input signal), and thus will produce a relatively small amount of IMD products
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As with passive mixers, there are different types of active mixers The single-ended FET mixer of Fig 713 is comprised of a JFET, some biasing components, and two tuned tanks The RF input signal is dropped across the first tuned input tank and sent to the JFET s gate An LO signal is inserted into the source lead, with the resultant converted signal removed from the JFET s drain and placed across the tuned output tank This second tank is tuned to the desired IF output frequency, with most of the mixing, RF signal, and LO frequencies being severely attenuated by this circuit The secondary circuit of the output transformer takes this signal, reduces the high-output impedance, and places it into the IF amplifiers A dual-gate MOSFET mixer of the type shown in Fig 714 employs a MOSFET, some biasing components, and a single tuned tank The RF signal is sent through the coupling capacitor into the second gate while the LO is inserted into the first gate, with the sum and difference frequency, along with the mixer products, being sent on to the tuned circuit Since this output tank is tuned to exactly the desired IF frequency, all other frequencies are attenuated, while the IF frequency itself is dropped across the
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