Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Exponential
Patent
1998-09-25
2000-08-22
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Exponential
327361, 327561, 327103, G06F 7556
Patent
active
061078581
ABSTRACT:
An OTA having a completely linear transconductance characteristic or a squarer having an accurate square-law characteristic is provided, which is comprised of first and second differential circuits. The first differential circuit has a first differential pair of first and second MOSFETs whose sources are coupled together and a third MOSFET serving as a bypass transistor for the first differential pair. The first differential pair is driven by a first constant tail current. The second MOSFET is driven by a first constant driving current. The second differential circuit has a second differential pair of fourth and fifth MOSFETs whose sources are coupled together and a sixth MOSFET serving as a bypass transistor for the second differential pair. The second differential pair is driven by a second constant tail current. The fifth MOSFET is driven by a second constant driving current. A differential input voltage is applied across gates of the first and second MOSFETs and across gates of the fifth and fourth MOSFETs. When a difference or sum of drain currents of the first and fourth MOSFETs is used as an output, an OTA or squarer is realized. If each of the MOSFETs in the first and second differential circuits is replaced with a bipolar transistor, a hyperbolic sine or hyperbolic cosine circuit is realized.
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patent: 5925094 (1999-07-01), Kimura
Cunningham Terry D.
NEC Corporation
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