Current sense circuit

Details Current sense circuit Current sense circuit

2006-03-28

2006-03-28

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

C327S543000, C327S051000

Reexamination Certificate

active

07019581

ABSTRACT:
A method and circuit for tracking a load current and a load voltage to provide an output signal that is proportional to the load current. The circuit enables employment of high gate area (W/L) ratio for a current mirror type current sense circuit, while maintaining accuracy of a sense current. A tracking circuit tracks the load current and the load voltage providing equal biasing to a power pass transistor and a power sense transistor. The tracking circuit further supplies a gate voltage to a cascode transistor, which provides the output signal proportional to the load current. A trimming circuit allows adjustment of a current flowing through the cascode transistor enabling calibration of the circuit for variations of W/L ratio between the power pass transistor and power sense transistor due to manufacturing tolerances. Calibration may be performed during initial power-on and selected trimming transistors may be turned on or off.

REFERENCES:
patent: 5867014 (1999-02-01), Wrathall et al.
patent: 5903422 (1999-05-01), Hosokawa
patent: 6559684 (2003-05-01), Goodfellow et al.
patent: 6600362 (2003-07-01), Gavrila
patent: 6700365 (2004-03-01), Isham et al.
Linear Technology (LTC4054L-4.2) Manual, “150Ma Standalone Linear Li-Ion Battery Charger in ThinSOT.” 16pp. Available: www.linear.com.
Lee, Cheung Fai and Philip K.T. Mok. 2002. On-chip Current Sensing Technique for CMOS Monolithic Switch-mode Power Converters.IEEE.0-7803-7448-7/2/.

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