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April 2007 [Components] Controlling LO Leakage In Passive FET Modulators Passive FET modulators are commonly used in wireless base-transceiver-station (BTS) equipment. These zero-intermediate-frequency (zero-IF) modulators can provide excellent linearity with low carrier leakage, although the effects of reactive terminations can influence the carrier-leakage performance. Unwanted leakage can result from the loss of local-oscillator (LO) rejection nulling because of the terminating impedances. Fortunately, some simple diplexer circuits can provide... August 2005 [Components] Gauge Wideband LO Noise In Passive Tx/Rx Mixers Passive integrated-circuit (IC) mixers are widely used in cellular base-station transceivers because of their low noise and outstanding linearity. Suitable for both downconversion in receivers and upconversion in transmitters, these mixers nonetheless can be hindered by wideband noise boosted by buffer amplifiers used to increase local-oscillator (LO) levels. Fortunately, a single noise parameter for passive mixer ICs makes it possible to calculate system-related impairments when using these... |
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