SP8TSingle-Pole, Eight-Throw (switch)
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The model HMC322LP4 broadband non-reflective GaAs MESFET SP8T switch is packaged in a low cost leadless surface-mount package.
Also new is a nonterminated octuple changeover relay (SP8T).
(In the past three years, SP6T and SP8T switches have been introduced as well.) These first SP4T products required a negative bias ([V.sub.ee] = -5 V) and two GaAs switch logic control inputs of 0/-5 V.
The HMC241QS16 SP4T, HMC252QS24 SP6T and HMC253QS24 SP8T positive bias nonreflective switches with integrated decoders are the recent product additions, Volume production of these integrated decoder negative bias SPNT products has allowed the company to optimize their RF/digital designs for the next generation of positive bias products.
The original line of negative bias SPNT switches, which includes the HMC165S14 SP4T, HMC182S14 SP4T, HMC172QS24 SP6T and HMC183QS24 SP8T, offered customers a PCB area savings of one-third and only two to three control lines vs.
The model HMC253QS24 SP8T requires only +5 V bias at 6 mA and three positive voltage TTL-compatible control lines via an integrated 3:8 decoder.
Model 40-883 multiplexer (mux) versions expand the range of the vendor's PXI PF solid-state 6-GHz switching solutions with an SP8T (8:1) mux occupying two PXI slots and an SP16T (16:1) mux occupying three PXI slots.
The switch is one of a family of quality switches from SPDT through SP8T.
The product line comprises SPDT, SP4T, SP6T and SP8T switches, making it the most complete line of multithrow GaAs MMIC switches on the market today.
A more contemporary SP8T approach uses one SPDT and two SP4T GaAs MMIC switches requiring 10 to 18 control lines and associated logic drive circuitry (still not a small and simple approach).
The HMC183QS24 SP8T switch offers major benefits for adaptive switching functions in base stations, particularly savings in overall circuit size.
SPDT to SP8T monolithic switches with integrated drivers can help to improve and reduce the size of antenna, attenuator, filter and synthesizer matrices.