Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-06-12
1999-11-02
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330295, H03F 345, H03F 368
Patent
active
059778270
ABSTRACT:
A circuit arrangement includes a first differential amplifier stage with two amplifier members whose main current paths are coupled to one another and, via a first reference current source, to a first reference potential, and are coupled to a respective output terminal as well as, via a respective output impedance, to a second reference potential, and whose control terminals can be supplied with a first control signal, an output signal being available at the output terminals. At least one further differential amplifier stage is provided, each of which includes two further amplifier members whose main current paths are coupled to one another and, via a respective further reference current source, to the first reference potential and whose control terminals can be supplied with (a) further control signal(s). Linearization of the transfer characteristic of the circuit arrangement can be achieved while avoiding a loss of gain in that the output impedances are preferably constructed as identical voltage dividers provided with a respective tapping for each further differential amplifier stage, the main current paths of the further differential amplifier stages are connected to each time two pair-wise mutually symmetrical tappings, providing a predetermined division, of the two voltage dividers, the ratio of the instantaneous values of the control signals to one another is predetermined, and the division of the tappings of the voltage dividers and the ratio of the currents supplied by the reference current sources are adjusted to one another in such a manner that output signal components which exhibit a dependency on at least one higher power of the control signals cancel out. This circuit arrangement also offers an improved noise factor.
REFERENCES:
patent: 3444473 (1969-05-01), Sherman
patent: 4904952 (1990-02-01), Tanimoto
"A Linearization Technique for Variable Transconductors Using Emitter Coupled Pairs and its Application to a 1-volt Active Filter", by Tanimoto et al., Proceedings of ESCCIRC 90, pp. 165-168.
"Halbleiter-Schaltungstechnik", by U. Tietze et al., 1978, pp. 58-67.
Biren Steven R.
Lee Benny
Nguyen Patricia T.
U.S. Philips Corporation
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