X-Nico

3 unusual facts about electrical impedance


Lipid bilayer characterization

In addition to simple DC current measurements it is also possible to perform AC electrical characterization to extract information about the capacitance and complex impedance of a bilayer.

Punch-down block

In addition, punch-down blocks are being used to handle larger numbers of faster data signals, requiring greater care and proper procedures to control impedance and crosstalk.

Ringtone

In old phones, this voltage was used to trigger a high-impedance electromagnet to ring a bell on the phone.


LEMO

The LEMO 00, a miniature push-pull 50Ω coaxial connector, is used as front panel connectors in the Nuclear Instrumentation Module (NIM) and Computer Automated Measurement and Control (CAMAC) modular electronics standards used in instrumentation for nuclear and particle physics, where it is used as a replacement for BNC connectors in high density designs (because the LEMO connector is much smaller in size than a BNC).

Network synthesis filters

The driving point impedance is a mathematical representation of the input impedance of a filter in the frequency domain using one of a number of notations such as Laplace transform (s-domain) or Fourier transform (jω-domain).

Superposition theorem

The superposition theorem for electrical circuits states that for a linear system the response (voltage or current) in any branch of a bilateral linear circuit having more than one independent source equals the algebraic sum of the responses caused by each independent source acting alone, while all other independent sources are replaced by their internal impedances.


see also