Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Reexamination Certificate
2007-04-14
2009-11-10
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
C327S351000, C327S513000
Reexamination Certificate
active
07616044
ABSTRACT:
The intercept of a logarithmic amplifier is temperature stabilized by generating a signal having the form H log H where H is a function of temperature such as T/T0. The first H factor is cancelled, thereby generating a correction signal having the form Y log H. The cancellation may be implemented with a transconductance cell having a hyperbolic tangent function. The H log H function may be generated by a pair of junctions biased by one temperature-stable current and one temperature-dependent current. The pair of junctions and the transconductance cell may be coupled together in a translinear loop. A user-accessible terminal may allow adjustment of the correction signal for different operating frequencies.
REFERENCES:
patent: 4268759 (1981-05-01), Gilbert
patent: 4604532 (1986-08-01), Gilbert
patent: 4990803 (1991-02-01), Gilbert
patent: 5162678 (1992-11-01), Yamasaki
patent: 5296761 (1994-03-01), Fotowat-Ahmady et al.
patent: 5338985 (1994-08-01), Fotowat-Ahmady et al.
patent: 5352973 (1994-10-01), Audy
patent: 7180359 (2007-02-01), DiTommaso
Gilbert, Barrie; Translinear Circuits: An Historical Overview, 1996, Analog Integrated Circuits and Signal Processing, 1996, pp. 95-118.
Gilbert, Barrie; Monolithic Logarithmic Amplifiers, Analog Devices, Inc., Aug. 1994, pp. 1-122.
DC-Coupled Demodulating 120 MHz Logarithmic Amplifier (AD640), Analog Devices, Inc., 1999, pp. 1-16 (Rev. C).
Analog Devices Inc.
Marger & Johnson & McCollom, P.C.
Wells Kenneth B.
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