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Keysight Technologies
33330B/C Coaxial Detectors
for OEM and Systems Use
Technical Overview
General Information
The Keysight Technologies, Inc. 33330B/C Series of broadband coaxial detectors are specifically
designed for use in microwave instrumentation and systems applications such as the detecting
element in leveling loops, power monitoring, and as wideband video detectors.
These detectors utilize a Low Barrier Schottky (LBS) diode that requires no bias, has exceptional
broadband flatness and low SWR, and is environmentally rugged. For measurement accessory
applications, Keysight offers similar RF performance with a variety of input and output connectors
in the Model 423B, 8470B, and 8472B Series.
The Low Barrier Schottky diode detector
The 33330B/C detectors consist of a Low Barrier Schottky (LBS) diode and a miniature thin film
circuit that matches the diode to a 50-ohm transmission line. The diode is a specially fabricated
Schottky diode using metalization designed to achieve low origin resistance, thus eliminating the
need for bias. In addition to superior RF characteristics, the LBS detector offers significant advantages
over other types of detectors. For example, a typical Schottky requires bias for proper operation; a
tunnel diode detector has a limited power range because of its negative resistance region; and the
point contact diode, because of its fragile construction, is unsuitable for many field applications.
Frequency Range