Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Patent
1997-02-03
1998-05-05
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
330254, 327306, 327563, H03G 1108, G06G 712
Patent
active
057480273
ABSTRACT:
Low power, high linearity log-linear control method and apparatus wherein a master log-linear cell generates a control voltage that is buffered and applied to a slave log-linear cell. By breaking this function up into two pieces, the control loop characteristics are isolated from the signal path. Low impedance buffers can be used to drive the slave log-linear cell control ports, independent of the control loop, providing improved gain control range and linearity. This log-linear control is of particular value in applications that require low harmonic distortion and high gain control range in power or pin-constrained applications. Details of the method are disclosed.
REFERENCES:
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patent: 5256984 (1993-10-01), Lee
patent: 5442311 (1995-08-01), Trafton
patent: 5455816 (1995-10-01), Biting
patent: 5477191 (1995-12-01), Demicheli
patent: 5572166 (1996-11-01), Gilbert
patent: 5587688 (1996-12-01), Mulbrook
Maxim Integrated Products Inc.
Tran Toan
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