Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-01-09
2007-01-09
Nguyen, Linh My (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C323S316000, C341S120000
Reexamination Certificate
active
11153938
ABSTRACT:
A calibration circuit for a current source cell includes a reference current source and a transresistance amplifier forming a feedback loop for calibrating the output current of the current source cell. The reference current source supplies a reference current to a first node switchably connected to the current output node of the current source cell. The transresistance amplifier has an input terminal coupled to the first node and an output terminal switchably connected to a calibration node of the current source cell. With the calibration circuit coupled for calibration, an input current develops at the first node being the difference between the output current of the current source cell and the reference current. The transresistance amplifier receives the input current and generates an output voltage for driving the calibration node. The output voltage has a value operative to nullify the difference between the output current and the reference current.
REFERENCES:
patent: 5055847 (1991-10-01), Rybicki et al.
patent: 5221890 (1993-06-01), Shyu et al.
patent: 6525609 (2003-02-01), Behzad
patent: 6583740 (2003-06-01), Schofield et al.
patent: 6876249 (2005-04-01), Maigret et al.
patent: 7038544 (2006-05-01), Diorio et al.
patent: 7042374 (2006-05-01), Manganaro
D. Wouter et al., “A Self-Calibration Technique for Monolithic High-Resolution D/A Converters,” IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, pp. 1517-1522.
Cook Carmen C.
Hiltunen Thomas J.
National Semiconductor Corporation
Nguyen Linh My
Patent Law Group LLP
LandOfFree
Analog calibration of a current source array at low supply... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Analog calibration of a current source array at low supply..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analog calibration of a current source array at low supply... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3805140