Showing papers on "Transimpedance amplifier published in 1969"
Patent•
08 Oct 1969
TL;DR: In this article, an apparatus consisting of an electrode for detection of biopotentials and a high-input impedance, low-noise amplifier with and in direct contact with the electrode, the input terminal of the first active device of the amplifier being epoxy bonded to the electrode.
Abstract: An apparatus is disclosed comprising an electrode for detection of biopotentials, and a high-input impedance, low-noise amplifier packaged with and in direct contact with the electrode, the input terminal of the first active device of the amplifier being epoxy bonded to the electrode. The amplifier is designed with thick film resistors, and without any capacitors, thus minimizing noise generation in the amplifier.
27 citations
TL;DR: In this paper, the current conveyor is applied to the design of a simple current-measuring probe, and the output voltage of the probe is directly proportional to the measured current with the transimpedance being chosen almost at will.
Abstract: The current conveyor?a new circuit building block recently introduced?is applied to the design of a simple current-measuring probe. The monopolar version of this probe features high stability and accuracy (0.5 percent of nominal reading). A dc to 100-MHz frequency band is obtained from the bipolar version. Both versions minimize the disturbance to the measured circuit by presenting a very low impedance at the current-measuring terminals. The output voltage of the probe is directly proportional to the measured current with the transimpedance being chosen almost at will. The design makes use of a dual transistor and a commercially available integrated circuit.
24 citations
TL;DR: In this paper, a segmented-drift-field electrode structure was used to obtain significant electronic gain at a much lower voltage than that required for conventional surface-wave amplifiers.
Abstract: Experimental results obtained from a surface-wave amplifier using a segmented-drift-field electrode structure are reported. It is shown that significant electronic gain can be obtained at a much lower voltage than that required for conventional surface-wave amplifiers.
13 citations
Patent•
17 Mar 1969
TL;DR: In this article, the current AMPLIFIER and current INVERTING CIRCUITS are described, which are described as being located in SEMI-CONDUCTOR ELEMENTS and operate in the current domain.
Abstract: CURRENT AMPLIFIER AND CURRENT INVERTING CIRCUITS ARE DESCRIBED WHICH ARE COMPRISED OF SEMI-CONDUCTOR ELEMENTS AND WHICH OPERATE IN THE CURRENT DOMAIN.
9 citations
01 Jan 1969
TL;DR: In this paper, a stage-by-stage design of a four-stage operational amplifier with primary emphasis on speed without sacrifice of d.c. performance and time-domain response is presented.
Abstract: The limitations in the design of such amplifiers are reviewed. The stage-by-stage design of a four-stage operational amplifier with primary emphasis on speed without sacrifice of d.c. performance is presented. The layout and connection of the internal capacitor used for improvement of the frequency response are discussed. The a.c. performance and time-domain response are presented.
9 citations