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:
Oct. 10, 1978
Filed:
Dec. 02, 1977
Friedrich Harless, Nuremberg, DE;
Siemens Aktiengesellschaft, Berlin & Munich, DE;
Abstract
In the illustrated embodiments, a transistor amplifier stage has filter components in its input circuit providing a 12 dB/octave rise in response above a selected frequency. A bridging circuit of variable resistance may be provided for introducing a desired degree of low frequency response. A continuously controlled or switched transistor circuit may modify the resistance values in a base-emitter circuit and in a base-collector circuit of the filter network simultaneously to increase the cut-off frequency while retaining the 12 dB/octave rate of rise in response. Both the low frequency response in the attenuation range and the cut-off for the high frequency response range may be adjustable in the same amplifier stage, or a quantized selection of successive cut-off frequencies is feasible using e.g. a plurality of amplifier stages in cascade.