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HSMS-282X-TR2G Datasheet(PDF) 6 Page - AVAGO TECHNOLOGIES LIMITED |
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HSMS-282X-TR2G Datasheet(HTML) 6 Page - AVAGO TECHNOLOGIES LIMITED |
6 / 15 page 6 • The two diodes are in parallel in the RF circuit, lowering the input impedance and making the design of the RF matching network easier. • The two diodes are in series in the output (video) circuit, doubling the output voltage. • Some cancellation of even‑order harmonics takes place at the input. DC Bias DC Biased Diodes Zero Biased Diodes Figure 12. Voltage Doubler. The most compact and lowest cost form of the doubler is achieved when the HSMS‑2822 or HSMS‑282C series pair is used. Both the detection sensitivity and the DC forward voltage of a biased Schottky detector are temperature sensitive. Where both must be compensated over a wide range of temperatures, the differential detector[2] is often used. Such a circuit requires that the detector diode and the reference diode exhibit identical characteristics at all DC bias levels and at all temperatures. This is accomplished through the use of two diodes in one package, for exam‑ ple the HSMS‑2825 in Figure 13. In the Avago assembly facility, the two dice in a surface mount package are taken from adjacent sites on the wafer (as illustrated in Figure 14). This 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. [1] Avago Application Note 956‑4, “Schottky Diode Voltage Doubler.” [2] Raymond W. Waugh, “Designing Large‑Signal Detectors for Handsets and Base Stations,” Wireless Systems Design, Vol. 2, No. 7, July 1997, pp 42 – 48. Thus, p‑type diodes are generally reserved for detector applications (where very high values of RV swamp out high RS) and n‑type diodes such as the HSMS‑282x are used for mixer applications (where high L.O. drive levels keep RV low). DC biased detectors and self‑biased detec‑ tors used in gain or power control circuits. Detector Applications Detector circuits can be divided into two types, large signal (P in > ‑20 dBm) and small signal (Pin < ‑20 dBm). In general, the former use resistive impedance matching at the in‑ put to improve flatness over frequency—this is possible since the input signal levels are high enough to produce adequate output voltages without the need for a high Q reactive input matching network. These circuits are self‑ biased (no external DC bias) and are used for gain and power control of amplifiers. Small signal detectors are used as very low cost receivers, and require a reactive input impedance matching net‑ work to achieve adequate sensitivity and output voltage. Those operating with zero bias utilize the HSMS‑ 285x family of detector diodes. However, superior performance over temperature can be achieved with the use of 3 to 30 µA of DC bias. Such circuits will use the HSMS‑282x family of diodes if the operating frequency is 1.5 GHz or lower. Typical performance of single diode detectors (using HSMS‑2820 or HSMS‑282B) can be seen in the transfer curves given in Figures 7 and 8. Such detectors can be re‑ alized either as series or shunt circuits, as shown in Figure 11. DC Bias Shunt inductor provides video signal return Shunt diode provides video signal return DC Bias DC Biased Diodes Zero Biased Diodes Figure 11. Single Diode Detectors. The series and shunt circuits can be combined into a volt‑ age doubler[1], as shown in Figure 12. The doubler offers three advantages over the single diode circuit. |
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