The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1976
Filed:
Oct. 10, 1974
Sony Corporation, Tokyo, JA;
Abstract
An amplifying circuit for use with a transducer includes a pair of field-effect transistors which are of different conductive types from each other and each of which has gate, drain and source electrodes. The gate electrodes of the field-effect transistors are connected to each other and are further connected to an output terminal of an electrostatic type mechanical-electrical transducer, while the source electrodes of the field-effect transistors are connected to each other and are further connected to an output circuit. One of the drain electrodes is connected to a voltage source and the other drain electrode is connected to the circuit ground. High input impedance is maintained by using no gate resistor at the input, and using a current-sourced source-follower secondstage. Source resistors improve linear performance.