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Zero Bias Schottky Detector Diode - App Note

From Avago Technologies
 

 
A conventional Schottky diode detector such as the Avago Technologies HSMS-8101 requires no bias for high level input power - above one milliwatt. However, at low levels, a small amount of dc bias is required for detection to take place. Even though this bias current is at the microampere level, this requirement is often difficult to supply. A Schottky diode has been developed to eliminate this need for dc bias. Figure 1 shows the forward current characteristics of the HSMS-8101 Schottky diode and two versions of zero bias diodes, HSMS-2850 and HSCH-3486. These curves are close to the curves predicted by the diode equation with the constants shown in Table 1. HSMS-8101, a conventional (n-type or mixer) Schottky requiring dc bias to operate as a detector, stands out from the two (p-type) zero bias diodes with its very low value of saturation current and its low series resistance.
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Topics of Interest
The zero bias Schottky diode detector is ideal for RF/ID tag applications where it can be used to fabricate a receiver which consumes no primary power. However, its performance is heavily dependent... (Read More)
Conventional Schottky detector diodes are tested and specified with 20 microamperes of DC bias. The bias current reduces the junction resistance so that most of the detected voltage appears across the... (Read More)
This application note has been written to demonstrate how the Avago Technologies EEsof ADS software package can be used to simulate a diode detector circuit reliably against temperature. For this... (Read More)
Zero bias detectors with higher forward voltage have better voltage sensitivity. For example, the HSCH-3206 with a forward voltage of about 200 millivolts at 0.1 milliampere is better than the... (Read More)
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