Title:
ACTIVE GROUND CIRCUIT
Document Type and Number:
Japanese Patent JP3236377
Kind Code:
B2
Abstract:
PURPOSE: To obtain a constant potential over a wide frequency band by adding a reference potential to the voltage follower of a high input impedance, and connecting the input of an impedance converter with a ground potential.
CONSTITUTION: A voltage follower A is the impedance converter of a high input impedance constituted of a general arithmetic amplifier. Then, a bypass capacitor C1 and a bias current supplying resistance R are connected in parallel, one edge is connected with the non-inversion input of the voltage follower A, and the other edge is grounded. Then, the inversion input of the voltage follower A is connected with the output, the output is connected with a ground potential terminal X, and the common potential of the voltage follower A is connected with a common potential terminal Y. The common potential terminal Y is incompletely connected, connected with one part of a circuit 1 whose potential is not constant, a difference with the ground potential of the capacitor C1 is generated between the terminals X and Y, and the ground potential of a constant low impedance can be always obtained at the ground potential terminal X.
Inventors:
Nobuo Okamura
Application Number:
JP33881592A
Publication Date:
December 10, 2001
Filing Date:
December 18, 1992
Export Citation:
Assignee:
JEOL Ltd.
International Classes:
H04B15/00; H03F3/45; (IPC1-7): H04B15/00; H03F3/45
Domestic Patent References:
| JP6451705A |
Attorney, Agent or Firm:
Ryuyoshi Abe (7 outside)
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