Amplifier having frequency compensation by gain degeneration
Patent 5642078 Issued on June 24, 1997. Estimated Expiration Date: 
September 29, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 29, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPower amplifier Apparatus and method for a wide-band direct-coupled transistor amplifier Amplifier arrangement with improved quiescent current control Amplifiers 5117200 Differential operational amplifier Patent #: 5157349 InventorsAssigneeApplicationNo. 535977 filed on 09/29/1995US Classes:330/253, Having field effect transistor330/254, Having gain control means330/255, Having push-pull amplifier stage330/259Having D.C. feedback bias control for stabilizationExaminersPrimary: Mullins, James B.Attorney, Agent or FirmForeign Patent References
International ClassesH03F 003/45H03G 003/30 AbstractAn amplifier having an inverting and a non-inverting input and at least one output is compensated by dynamically varying the transconductance of a gain stage in accordance with the gain of the output stage of the amplifier. The amplifier comprises a gain section having at least one output, where a gm of the gain section varies with a transconductance control signal. The amplifier further comprises an output stage comprising a output drive device controlled by an output of the gain section. A bias control circuit is coupled to drive the transconductance control input of the gain section, the bias control circuit increasing a differential mode transconductance of the first gain stage when the active pullup or pulldown output drive device has low gain.Other References
Field of SearchBias control signal from input of amplifierHaving field effect transistor Having gain control means Having push-pull amplifier stage Having D.C. feedback bias control for stabilization Having D.C. feedback bias control for stabilization Including D.C. feedback bias control for stabilization Including protection means And feedback means | |
