About DC Blocks
DC blocks are used to prevent direct current (DC) energy from flowing through sensitive radio frequency (RF) components. DC blocks are essentially capacitors in series with a transmission line. The capacitors prevent the flow of DC energy while allowing RF signals to pass with small or no attenuation. Electrical signals can include a DC component and an AC component. DC blocking can remove the DC component from portions of the circuit where a DC bias is undesirable. If the DC blocking capacitor is on the center conductor, the DC block is called an inner block. If the DC capacitor is on the outer conductor, the DC block is called an outer block. An inner/outer block prevents DC from passing on both conductors. A DC block can be incorporated into a connector block (also called a block connector).
Electrical specifications for DC blocks include frequency range (for example, from DC to 10 GHz or 0.01 to 3 GHz), maximum voltage standing wave ratio (VSWR), insertion loss, maximum DC voltage, breakdown voltage, and power rating (peak or CW). The electrical specifications can vary depending on the type of connector (N, BNC, SMA, 2.9 mm, and 2.4 mm). Material specifications for DC blocks include body material (for example, stainless steel), substrate (for example, alumina), solder type (for example, SN62, lead free, tin/lead), insulator (for example, Teflon?), and contacts (for example, gold-plated beryllium copper). Rugged construction helps ensure reliability and consistent performance over the stated frequency range. Teflon is a registered trademark of DuPont.
More >>Other Topics You Might Be Interested In
-
DC/DC Converters In Power Sequencing Systems
System power from multiple supply voltages utilize power up/down sequencing to avoid IC latch up, a potential cause of catastrophic failure of a system. Semiconductor companies offer different ICs to...(read more)
-
Programming The AD35 DC/DC Converter
Referring to Figure 1A, amplifier A1 consists of a low voltage op amp and a high voltage NPN transistor Q1. By grounding the negative output of the AD35, the converter operates as a single positive...(read more)
-
Operational Amplifier Topologies and DC Specifications
Operational amplifiers (op amps) are as prolific in analog circuits as salt and pepper is on food. They are sprinkled throughout the sensor data acquisition system, performing a variety of functions....(read more)
Engineering Web: DC Blocks
Pages: 1 - 3 of 308
|
Xilinx WP279 Digitally Removing a DC Offset: DSP Without... White Paper: Xilinx FPGAs R WP279 (v1.0) July 18, 2008 Digitally Removing a DC Offset: DSP Without Mathematics By: Ken Chapman Many designers feel See Xilinx, Inc. Information |
|
|
Common Building Blocks - AC/DC Adapter Centre Intel pour les revendeurs ? Common Building Blocks - AC/DC Adapter See Intel Corporation Information |
|
|
DC Machine (SimPowerSystems) DC Machine Implement a separately excited DC machine This block implements a separately excited DC machine. See MathWorks, Inc. (The) Information |
