Compensation for detectors
AssigneeAnalog Devices, Inc.
InventorVincenzo DiTommaso
Life of this patent
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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.
Claims25
A system comprising:
- a log amp;
- and
- a temperature compensation circuit coupled to the log amp to generate a correction signal by multiplying a signal having the form H log H by a factor 1/H.
A method comprising:
- generating a first signal having the form H log H;
- multiplying the first signal by a factor 1/H, thereby generating a correction signal having the form Y log H;
- and
- coupling the correction signal to a log amp.
An integrated circuit comprising:
- a temperature compensation circuit to generate a correction signal having the form Y log H;
- and
- a user-accessible terminal to allow a user to externally adjust the magnitude of the correction signal.
An integrated circuit comprising:
- a compensation circuit to provide compensation to a measurement device;
- and
- a user-accessible terminal to allow a user to externally adjust the magnitude of the compensation.
Dependencies are inferred from the claim text.