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, 1995
Filed:
Jun. 30, 1993
Geoffrey E Brehmer, Austin, TX (US);
Advanced Micro Devices, Inc., Austin, TX (US);
Abstract
An operational amplifier for low supply voltage applications. The operational amplifier includes inverting and non-inverting inputs and a single-ended output. The operational amplifier also includes source transistors for pushing the output and sink transistors for pulling the output to obtain particular output voltage swing. Connections between the inputs and output include DC biasing circuitry. In low supply voltage applications, voltage drop due to transistors of amplifier circuitry can be significant and can affect possible range of output voltage swing. The DC biasing circuitry includes four identically sized n-channel transistors; three of the n-channel transistors receive a second bias current input and one of the n-channel transistors receives a first bias current input, identical to the first three identically sized n-channel cascode transistors are connected to the n-channel transistor that receives the first bias current input and to two of the n-channel transistors receiving the second bias current input; the other n-channel transistor receives the second bias current input and is connected to a correcting transistor of select size and characteristics. The correcting transistor serves to maintain mirrored currents between each of the source transistors and each of the sink transistors to eliminate the implications of inequivalent voltage drop across corresponding series of transistors in the amplifier so that the range of output voltage swing, even in low supply voltage applications, closely approaches the value of the power supply voltage.