Current mirror having a high output voltage

Details Current mirror having a high output voltage Current mirror having a high output voltage

1988-04-21

1989-05-09

Salce, Patrick R.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323312, G05F 316

Patent

active

048292311

ABSTRACT:
A current mirror that comprises a first branch which includes the series arrangement of a diode (D.sub.1) and the main current path of a transistor (T.sub.1), and a second branch comprising the series arrangement of the main current path of a transistor (T.sub.2) and a diode (D.sub.2). In order to increase the voltage Vs available at the current mirror output, a diode (D.sub.3) is connected in the first branch and a transistor (T.sub.3) is connected in the second branch. One electrode of the diode (D.sub.3) is connected to the base of a transistor (T.sub.4), whose collector receives a supply voltage (U) and whose emitter is connected to the base of the transistor (T.sub.2). The base of the transistor (T.sub.1) is connected to one electrode of the diode (D.sub.2) and to the emitter of the transistor (T.sub.2). A diode (D.sub.4) is poled in the forward direction between the power-supply source U and the base of the transistor (T.sub.3). A diode Z, is poled in the reverse direction, is connected between the base of the transistor (T.sub.3) and the emitter of the transistor (T.sub.2) to allow the transistor T.sub.3 to be operated in the B.sub.VCBO mode when the diode is conductive.

REFERENCES:
patent: 4081696 (1978-03-01), Oda et al.
patent: 4471236 (1984-09-01), Patterson

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