Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – With compensation
Patent
1998-08-26
2000-07-18
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
With compensation
327563, 330254, H03G 330, H03F 345
Patent
active
060912758
ABSTRACT:
A VGA control circuit includes a differential control voltage generator having an input coupled to an external control voltage and having a pair of control voltage outputs, a transfer function compression region TFCR compensator coupled to the differential control voltage generator, and a TFCR detector coupled to the TFCR compensator and developing a compensator activation signal in response to the detection of a TFCR state in the transfer curve. A method for controlling a VGA circuit exhibiting transfer function logarithmic compression includes detecting when a VGA circuit is entering a logarithmic compression state, and applying an exponential compensation signal to the VGA circuit to cancel the compression state. A VGA system includes a VGA control system developing a plurality of differential control signals and a plurality of VGA stages coupled to the plurality of differential control signals. The control system includes a differential offset generator coupled to an internally generated control voltage, and a plurality of swing limiters developing the plurality of differential control signals. The voltage applied to the differential offset generator is generated by a PTAT and a tanh.sup.-1 generator which has its input tied to the external control voltage.
REFERENCES:
patent: 4928074 (1990-05-01), Sato et al.
patent: 4963836 (1990-10-01), Noguchi et al.
patent: 5030923 (1991-07-01), Arai
patent: 5418494 (1995-05-01), Betti et al.
patent: 5677646 (1997-10-01), Entrikin
patent: 5682119 (1997-10-01), Soda
patent: 5841320 (1998-11-01), Ichihara
patent: 5896063 (1999-04-01), Marsh et al.
patent: 5900781 (1999-05-01), Igarashi et al.
patent: 5903185 (1999-05-01), Cargill
patent: 6011437 (2000-01-01), Sutardja et al.
Callahan Timothy P.
Englund Terry L.
Maxim Integrated Products Inc.
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