Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-12-18
2007-12-18
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S261000
Reexamination Certificate
active
11348461
ABSTRACT:
To provide a differential operational amplifier circuit that attains a wide-band and high-DC-gain characteristic and operates with a low power supply voltage. A signal path having three amplifier circuits passing an Nch transistor pair, cascode connected Nch transistor pairs, and a Pch transistor pair functions as a gain path having a high-gain and narrow-band characteristic. In addition, a signal path having two amplifier circuits passing an Nch transistor pair and another Nch transistor pair functions as a feedforward path having a low-gain and wide-band characteristic. Signals amplified through each path are synthesized at an output terminal, whereby a high-gain and wide-band operational amplifier is attained. Further, a constant current source transistor pair supplies a constant current to four drain load resistors of a first differential amplifying pair to drive a circuit with a constant current, thereby reducing a power supply voltage.
REFERENCES:
patent: 5057788 (1991-10-01), Ushida et al.
patent: 5461342 (1995-10-01), Crabtree
patent: 7138866 (2006-11-01), Etoh
patent: 2006/0250185 (2006-11-01), Sanduleanu et al.
patent: 2000-151305 (2000-05-01), None
Waltari, Mikko, et al., “A 220-MSample/s (MOS Sample-and-Hold Circuit Using Double Sampling”, Analog Integrated Circuits and Signal Processing, vol. 18, pp. 21-31 (1999).
Cho, Thomas B., et al., “A 10 b, 20 Msample/s, 35 mW Pipeline A/D Converter”, IEEE Journal of Solid-State Circuits, vol. 30, No. 3, Mar. 1995, pp. 166-172.
McGinn IP Law Group PLLC
Nguyen Hieu
Pascal Robert
LandOfFree
Operational amplifier circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Operational amplifier circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Operational amplifier circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3898085