Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1989-12-15
1991-01-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323315, H03F 304, 330, 323, 323
Patent
active
049839306
ABSTRACT:
In the class of electronic circuits known as current conveyors, limitations in the areas of frequency bandwidth, transient response, output impedance, distortion, accuracy, and suitability for integration are overcome by means of a current conveyor comprising a Wilson current mirror of one polarity type cross-coupled with a second Wilson current mirror of the opposite polarity type. The first Wilson current mirror is connected to an input port and a reference port. The second Wilson current mirror is supplied with current by a current-splitting circuit which also supplies an output port with a currrent that is proportional to, preferably half, the current supplied to the second current mirror. An emitter de-generation compensation scheme may optimize the transient response and stability of the mirrors. The current splitter may also comprise current mirrors. A voltage-to-current converter may be realised by connecting suitable resistors in series with the input and reference ports, respectively.
REFERENCES:
patent: 3582689 (1971-06-01), Smith et al.
patent: 3619798 (1971-11-01), Smith et al.
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Adams Thomas
Mullins James B.
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