Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-04-23
2000-08-22
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, H03F 345
Patent
active
061078824
ABSTRACT:
Embodiments of the invention include an amplifier such as a differential amplifier having an improved common mode voltage range (CMVR). The amplifier includes a translator coupled to a second stage amplifying circuitry wherein the translator uses feedback and a parallel connection of input devices to improve the common mode voltage range of the amplifier while providing for enablement of the circuit functionality. The translator uses parallel connections of N-channel and P-channel devices such as transistors to extract alternating current (ac) signals riding on a common mode voltage and to translate the extracted ac signals to ride on a constant reference voltage (V.sub.ref). The translated signals are then amplified in a conventional manner, such as by a gate thresholding or a self-biasing technique. An input sensing circuit within the translator provides an offset detection signal to a correction circuit, also within the translator. The correction circuit compares the signal with an applied reference signal (V.sub.ref) and, based thereon, applies a correction signal to the input sensing circuit. With the benefit of such correction signals, the input sensing circuit translates an input signal with a large common mode voltage range to an output signal that rides on the dc voltage that is approximately equal to the reference signal, V.sub.ref.
REFERENCES:
patent: 4520324 (1985-05-01), Jett, Jr. et al.
patent: 4577162 (1986-03-01), Peterson
patent: 5231318 (1993-07-01), Reddy
patent: 5406145 (1995-04-01), Arai et al.
Gabara Thaddeus John
Kothandaraman Makeshwar
Patel Bijit Thakorbhai
Choe Henry
Harman John M.
Lucent Technologies - Inc.
Pascal Robert
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