Tunable current-mode integrator for low-frequency filters

Details Tunable current-mode integrator for low-frequency filters Tunable current-mode integrator for low-frequency filters

2006-08-29

2006-08-29

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

C327S552000, C327S553000, C327S558000

Reexamination Certificate

active

07098718

ABSTRACT:
A tunable current mode integrator for low-frequency continuous-time filters that requires a reduced amount of area when implemented in an integrated circuit (IC). The integrator includes input and output transistors, and cross-coupled current mirrors, integration capacitors, and operational transconductance amplifiers (OTAs) that form a feedback structure with the input transistors. Input currents are converted to small current swings within the OTAs, and are subsequently integrated by the capacitors. Resulting integrated voltages are converted to output currents by the output transistors.

REFERENCES:
patent: 5389839 (1995-02-01), Heck
patent: 5530399 (1996-06-01), Chambers et al.
patent: 6278321 (2001-08-01), Franck
patent: 6335655 (2002-01-01), Yamamoto
patent: 6636098 (2003-10-01), Kizer
patent: 6664854 (2003-12-01), Tanaka et al.
patent: 6677822 (2004-01-01), Hasegawa
patent: 6930544 (2005-08-01), Yokoyama

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