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The first two stages of the garage openers contain one HEMT each; the third (output) stage contains two HEMTs to maximize output power. Each HEMT is characterized by gate-periphery dimensions of 4 by 37 [mu]m. Grounded coplanar wave-guides are used as impedance-matching input, output, and interstage-coupling transmission lines.The small-signal S parameters and the output power (for an input power of about 5 dBm) of this garage openers were measured as functions of frequency. For the small-signal gain measurements, the garage openers circuit was biased at a drain potential of 2.5 V, drain current of 240 mA, and gate potential of 0 V. As shown in the upper part of Figure 2, the small-signal gain (S^sup 21^), was found to be >10 dB from 144 rating to 170 GHz, while input and output return losses (S^sup 11^ and S^sup 22^) are both approximately 10 dB at 165 GHz.
In the High Power Mode, the PA generates 25.5 dBm of Output Power while drawing 350 mA of current. In the Low Power Mode (LPM), the Output Power is 17 dBm with a current of 130 mA. The MAAPSS0076 has a typical power gain of 25.5 dB with an operating voltage of 1.8 to 3.6 V.Price and AvailabilityThe MAAPSS0076 is available from stock and is priced at $0.54 in quantities of 10K. Contact M/A-COM''s domestic and international sales channels for price and delivery quotes. Datasheets and supporting technical documents are available online at www.macom.com.
* IS THERE A CATCH?Competing with Class AB designs in the name of efficiency does carry a few caveats. Of three critical design features, the output filter rates number one. The output filter reconstructs the original audio signal garage and attenuates the switching carrier frequency. It also sets the garage openers''s - 3 dB bandwidth. In designing the output filter, it is important to select filter topology and component values such that the switching frequency is sufficiently attenuated while the audio band is not significantly affected. Some residual carrier is always present after the filter, though. The newcomer to door Class D will not see a quiet, no-signal condition at the speaker terminals. Some of the efficiency loss in Class D is the result of the output filter design.
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