BOOK_CONTENT
From HF Filter Design and Computer Simulation

3.5 Wire

A straight isolated 22 AWG wire has an inductance of approximately 20 nH per inch of length. The inductance increases with smaller diameter wire. Grover [3] gives formulas for the inductance of various isolated conductors.

Conductors are generally placed in the vicinity of ground or other conductors, which lowers the effective inductance. For example, the 22 AWG wire has an inductance of approximately 26 nH when placed 1 inch above a ground plane, 19 nH at 0.2 inch spacing, and 12 nH when placed on top of 0.062 inch thick PWB with a ground plane. The effective inductance is more accurately predicted using transmission line concepts discussed later in this chapter. Appropriate transmission line models include a wire over ground, wire in a trough, wire between ground planes and others.

The 20 nH per inch approximation is suitable for estimating the additional inductance of leads on inductors or the parasitic lead inductance of capacitors and other components.

Copyright Noble Publishing Corporation 1994 under license agreement with Books24x7

Products & Services
Electrical Inductance Sensors
Electrical inductance sensors measure the inductance of an electrical component or system.
Inductors, Coils, and Chokes
Inductors coils and chokes are passive components that are designed to resist changes in current and store energy in the form of a magnetic field. 
Grounding Straps
Grounding straps are anti-static devices that are used to protect people and electronic equipment from electrostatic discharges (ESD) by routing the electric current to a safe ground.
Electrical Power Wires
Electrical power wires are solid or stranded conductors surrounded by insulation, shielding, and a protective jacket. 

Topics of Interest

3.6 Circular Ring The inductance of a circular ring (loop) of wire [4] is (17) where a is the mean radius of the ring and d is the diameter of the wire in inches.

6.6 Effect of Bond-wire Inductance At higher frequencies when the discrete power transistors are used in hybrid power-amplifier integrated circuits, it is necessary to take into account the device...

This chapter is an introduction to inductance and capacitance, their voltage-current relationships, power absorbed, and energy stored in inductors and capacitors. Procedures for analyzing circuits...

This chapter is an introduction to inductance and capacitance, their voltage-current relationships, power absorbed, and energy stored in inductors and capacitors. Procedures for analyzing circuits...

In This Chapter Some of the subtleties of passive components including construction techniques of these devices and parasitic effects are considered. We ll cover some details about resistors,...