Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1998-04-02
1999-10-26
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330265, H03F 326
Patent
active
059735643
ABSTRACT:
An operational amplifier output circuit having a low, stable quiescent current includes an input stage (22) receiving an input voltage (v.sub.in ") and producing first (v.sub.1) and second (v.sub.2) signals. An output stage (23) includes a pull-up transistor (1) and a pull-down transistor (2), a base of the pull-up transistor (1) receiving the first signal (v.sub.1). An emitter of the pull-up transistor (1) is coupled by an output conductor (30) to a collector of the pull-down transistor (2). A base of the pull-down transistor is coupled to receive the second signal (v.sub.2), and an emitter of the pull-down transistor (2) is coupled to a second reference voltage conductor (GND). A feedback stage (24) includes a first sensing circuit (36) coupled to the pull-up transistor 1 and produces a third signal (v.sub.3) representing a collector current of the pull-up transistor (1), a second sensing circuit (37) coupled to the pull-down transistor (2) and producing a fourth signal (v.sub.4) representing a collector current of the pull-down transistor (2), a combining circuit (38) receiving the third (v.sub.3) and fourth (v.sub.4) signals to produce an error signal (v.sub.5) representing the larger of the third (v.sub.3) and fourth (v.sub.4) signals, and an error amplifier (17) receiving the error signal (v.sub.5) to produce a feedback signal (v.sub.6) regulating the first (v.sub.1) and second (v.sub.2) signals to establish a stable quiescent current in the pull-up transistor (1) or the pull-down transistor (2).
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A 1-GHz Bipolar Class-AB Operational Amplifier with Multipath Nested Miller Compensation for 76-dB Gain, by Klaas-Jan de Langen et al., IEEE Journal of Solid State Circuits, Vol. 32, No. 4, Apr., 1997, pp. 488-498.
Burr-Brown Corporation
Choe Henry
Lee Benny
LandOfFree
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