Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1988-09-07
1990-01-09
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
048930903
ABSTRACT:
A signal voltage applied between the input terminals is converted by means of a differential amplifier into two phase-opposed signal currents which are inverted by means of a differential-to-single-ended converter into a single-ended signal current. The converter comprises a first and a second transistor with a common gate electrode and a third and a fourth transistor also with a common gate electrode, while the drain electrode of the third transistor is connected to the common date electrode of the first and the second transistor. The common gate electrode of the third and the fourth transistor is maintained at a voltage which is equal to the sum of one threshold voltage and two saturation voltages by means of a further transistor whose gate electrode is connected to the drain electrode and to a bias current source. The output of the amplifier can be driven by means of this converter up to two saturation voltages of the negative supply terminal.
REFERENCES:
patent: 4447782 (1984-10-01), Swanson
patent: 4471292 (1984-09-01), Schenck et al.
patent: 4550284 (1985-10-01), Sooch
patent: 4618815 (1986-10-01), Swanson
Goodman Edward W.
Mullins James B.
U.S. Philips Corporation
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