Magnetic pickup preamplifier
US4547819A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 1983 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | May 4, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/187
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic pickup which contains both resistance and stray capacitance is terminated by a negative impedance of a kind which compensates for the stray capacitance and part of the resistance, and causes a pole to be produced at a low frequency. This results in the formation of a virtually perfect integrator. Preferably the integrator is followed by a pedestal filter for receiving the output signal of the integrator, and has a zero phase shift point at a predetermined frequency higher than the frequency of the pole and within the frequency band, and has an intermediate frequency band transfer characteristic which increases at a rate of approximately equal to the decrease in transfer characteristic of integrator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.