Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – By integrating
Patent
1995-09-13
1998-08-11
Wambach, Margaret Rose
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
By integrating
327103, 327344, 327345, G06G 764
Patent
active
057932425
ABSTRACT:
An integrator circuit is disclosed which overcomes problems in the art described above. In accordance with the present invention, an integrator circuit includes a differential input transconductance stage which converts an input differential signal to a differential current at first and second internal nodes. These two internal nodes are buffered from an integrating capacitor by two pass transistors, the conductance of which is automatically adjusted in response to the voltage at the two nodes. In this manner, the first and second nodes act as nearly ideal current sources. Thus, the integrating capacitor sees a nearly infinite impedance, thereby allowing the integrator circuit to achieve a large RC time constant while employing relatively small internal resistances. Further, the integrator circuit is fully differential and includes a floating capacitor having equal leakages on each of its plates. Being responsive only to differential signals, the integrator circuit thus ignores common mode leakages. The symmetrical design of the integrator circuit allows integration to take place on both sides of the capacitor. These features enable the integrator circuit to operate not only at low frequencies and at low supply voltages but also over wide variations in operating temperatures.
REFERENCES:
patent: 4362999 (1982-12-01), Sauer
patent: 4871985 (1989-10-01), Sempel
patent: 5293514 (1994-03-01), Nakagawara
patent: 5489872 (1996-02-01), Gopinathan
Kwok Edward C.
National Semiconductor Corporation
Wambach Margaret Rose
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