RC and SC filter compensation in a radio transceiver

Details RC and SC filter compensation in a radio transceiver RC and SC filter compensation in a radio transceiver

2006-02-21

2006-02-21

Shingleton, Michael B (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S018000, C331S025000, C327S552000, C327S553000, C327S554000, C327S555000, C327S556000, C327S557000, C327S558000, C327S559000, C333S172000, C333S174000

Reexamination Certificate

active

07002417

ABSTRACT:
Disclosed is apparatus for operating with an RC filter (26, 26A), and a corresponding method. The apparatus includes circuitry (32) for use in measuring an actual value of at least one filter component and a controller (34), coupled to the measurement circuitry, for determining at least one adaptive filter (36, 46) coefficient using the measured actual value to so as to compensate for a deviation of at least one filter component value from an ideal value. Where the filter is embodied as an RC network, the circuitry measures an actual value of both a resistor and a capacitor, and the controller uses the measured actual value of the capacitor when determining the value of a resistor.

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McMahill, D. et al, “A 2.5-Mb/s GFSK 5.0-Mb/s 4 FSK Automatically Calibrated E-Δ Frequency Synthesizer”, IEEE Journal of Solid-State Circuits, vol. 37., No 1, pp 18-26, Jan. 2002.

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