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HSMS-282M-TR1 Datasheet(PDF) 7 Page - Agilent(Hewlett-Packard) |
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HSMS-282M-TR1 Datasheet(HTML) 7 Page - Agilent(Hewlett-Packard) |
7 / 14 page 7 assures that the characteristics of the two diodes are more highly matched than would be possible through individual testing and hand matching. matching network differential amplifier HSMS-2825 bias Figure 13. Differential Detector. Figure 14. Fabrication of Agilent Diode Pairs. In high power applications, coupling of RF energy from the detector diode to the reference diode can introduce error in the differential detector. The HSMS-282K diode pair, in the six lead SOT-363 package, has a copper bar between the diodes that adds 10 dB of additional isolation between them. As this part is manufactured in the SOT-363 package it also provides the benefit of being 40% smaller than larger SOT-143 devices. The HSMS-282K is illustrated in Figure 15 — note that the ground connections must be made as close to the package as possible to minimize stray inductance to ground. PA detector diode reference diode to differential amplifier Vbias HSMS-282K Figure 15. High Power Differen- tial Detector. The concept of the voltage doubler can be applied to the differential detector, permitting twice the output voltage for a given input power (as well as improving input impedance and suppressing second harmonics). However, care must be taken to assure that the two reference diodes closely match the two detector diodes. One possible configuration is given in Fig- ure 16, using two HSMS-2825. Board space can be saved through the use of the HSMS-282P open bridge quad, as shown in Figure 17. matching network differential amplifier HSMS-2825 HSMS-2825 bias Figure 16. Voltage Doubler Differential Detector. differential amplifier HSMS-282P bias matching network Figure 17. Voltage Doubler Differential Detector. While the differential detector works well over temperature, another design approach[3] works well for large signal detectors. See Figure 18 for the schematic and a physical layout of the circuit. In this design, the two 4.7 K Ω resistors and diode D2 act as a variable power divider, assuring constant output voltage over temperature and improving output linearity. RFin Vo D1 33 pF HSMS-2825 or HSMS-282K HSMS-282K 4.7 K Ω 33 pF 4.7 K Ω 4.7 K Ω D2 68 Ω 68 Ω RFin Vo Figure 18. Temperature Compen- sated Detector. In certain applications, such as a dual-band cellphone handset operating at both 900 and 1800 MHz, the second harmonics generated in the power control output detector when the handset is working at 900 MHz can cause problems. A filter at the output can reduce unwanted emissions at 1800 MHz in this case, but a [3] Hans Eriksson and Raymond W. Waugh, “A Temperature Compensated Linear Diode Detector,” to be published. |
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