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:
Jun. 10, 1980
Filed:
Jul. 17, 1978
David L Cave, Phoenix, AZ (US);
Wilson D Pace, Tempe, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
An amplifier circuit is disclosed which includes a current supply circuit having a field effect transistor and negative feedback for degenerating the magnitude of the current supplied thereby. The negative feedback can be provided by a diffused resistor connected between the gate and source electrodes of the current supply field effect transistor. A differential amplifier which includes a pair of differentially coupled amplifying field effect transistors is coupled to the current supply circuit. The negative feedback enables the current supply device to provide a current which compensates the differentially coupled field effect transistors over processing while not deleteriously affecting the temperature characteristics thereof. A bipolar diode and a bipolar transistor can be included in the current supply for enabling the resistor to take up less chip area and for allowing more flexibility in the design of the geometry of the current supply, field effect transistor.