Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-05-10
1999-07-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327530, 327552, 323315, 323312, H03K 1716, G05F 316
Patent
active
059260602
ABSTRACT:
A current mirror model is provided for designing a continuous-time filter with reduced filter noise. The current mirror model includes an input branch having a voltage V.sub.in across a series circuit including a voltage source and a resistor of resistance value R.sub.m. The voltage source has a voltage value substantially equal to the value 4kTR.sub.m, where k is the Boltzmann constant and T is the temperature. An output branch is coupled to the input branch. The output branch has a first current source and a second current source. The first current source is controlled by the voltage V.sub.in and sources a current substantially equal to a transconductance G.sub.m of the output branch times the voltage V.sub.in. The output branch transconductance G.sub.m has a transconductance value substantially less than a value of an input branch conductance 1/R.sub.m. The second current source, coupled in parallel to the first current source, sources a current substantially equal to the value 4kTG.sub.m.
REFERENCES:
patent: 4032839 (1977-06-01), Ahmed
patent: 4963764 (1990-10-01), Quan
patent: 5334929 (1994-08-01), Shade, Jr.
patent: 5459430 (1995-10-01), Ryat
Nielsen Ivan Riis
Olgaard Christian
Callahan Timothy P.
Kwok Edward C.
Le Dinh
National Semiconductor Corporation
Woo Philip W.
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