Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-09-14
2000-01-18
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330301, H03F 345
Patent
active
060160780
ABSTRACT:
A MOS integrated multistage differential single ended amplifier circuit includes an input circuit generating two differential current outputs, and an output circuit. The output circuit includes a current mirror circuit including two current generators and two branches into which are injected two currents each corresponding to a difference between a bias current generated by a respective current generator and a respective differential current output of said input circuit. The output circuit also includes two diode-connected MOS transistors forming respective current mirrors with the two current generators through which the differential output currents are respectively forced, mirroring the differential output currents on the current generators, respectively, and with a certain mirroring ratio. Two voltage reference MOS transistors are also provided having gates connected to injection nodes of the differential output currents on the diode-connected MOS transistors. A load transistor is also provided for the current mirror. A gate of each of the voltage reference MOS transistors may be dimensioned to make a sum of currents flowing therethrough corresponding to a sum of the signal currents in the branches of the current mirror circuit of the output stage divided by twice a mirroring ratio between the load transistor and the diode-connected MOS transistor of said current mirror circuit.
REFERENCES:
patent: 4585961 (1986-04-01), Daubert
patent: 4866312 (1989-09-01), Kearney et al.
patent: 5349304 (1994-09-01), Ryat
patent: 5381113 (1995-01-01), Kimura
patent: 5907259 (1999-05-01), Yamada et al.
Choe Henry
Lee Benny
STMicroelectronics S.r.l.
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