Apparatus and method for frequency compensating an operational amplifier

U.S. Patent Number: 5392000

Abstract: A transimpedance circuit (201), and method therefor, frequency compensates an operational amplifier. The transimpedance circuit (201) has an input terminal (205) coupled to receive an amplified signal (205) and an ouput terminal (206) operative to produce a buffered amplified signal. The input terminal (205) of the transimpedance circuit (201) presents a resistive input impedance to the amplified signal at a frequency substantially near an open loop unity gain frequency of the operational amplifier (200). The amplified signal is buffered from a complex impedance of an input terminal (206) of an output driver (103). The present invention advantageously provides wide bandwidth and stable operation with loads having low complex impedance.

Inventors: Gillig; Steven F. (Roselle, IL)

Assignee: Motorola, Inc. (Schaumburg, IL)

Application Number: 08/149,683

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 330/107 ; 330/292

Field of search: 330/107,109,290,292,294,302,311

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