Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1985-04-01
1986-08-19
LaRoche, Eugene R.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330261, 330267, H03F 345, H03F 326
Patent
active
046072322
ABSTRACT:
An electronic circuit is provided comprising: a pair of transistors having collector electrodes connected together at an output terminal and emitter electrodes coupled to opposite potentials of a voltage supply; a current source; and, means, responsive to a current produced by the current source, for establishing bias currents to base electrodes of the pair of transistors in accordance with an input signal, such bias currents being dependent on the current produced by the current source and being substantially independent of, over a nominal operating supply voltage range of the circuit, of variations in the voltage supply. With such arrangement, since the bias current to the transistors are provided from a current source, the bias currents are independent of the voltage supply and the circuit may operate with less than a one volt voltage supply. In accordance with a preferred embodiment of the invention, a resistor is coupled between the voltage supply and an emitter of one of the pair of transistors. With such arrangement current gain is provided. Further, the supply voltage may be as low as 2V.sub.CE(SAT) +IR where IR is the voltage drop across the resistor, typically 30 millivolts. Hence, the minimum supply voltage is still less than one volt.
REFERENCES:
patent: 4267519 (1981-05-01), Schade, Jr.
LaRoche Eugene R.
Maloney Denis G.
Mottola Steven J.
Raytheon Company
Sharkansky Richard M.
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