Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2008-07-15
2008-07-15
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000
Reexamination Certificate
active
07400190
ABSTRACT:
Continuous-time filter system with self-calibration means. The system comprises a master control unit (36) and a slave unit with one or more slave filters (27.1-27.n). The master control unit (36) comprises an integrator (30) having circuit elements (33, C) which match those elements of the slave filter (27.1-27.n) that define the slave filter's time constant (τ). Furthermore, the master control unit (36) comprises a voltage comparator (35) connected to an output (34) of the integrator (30), the voltage comparator (35) providing an output frequency signal (fcom), and a phase frequency comparator (PFC;28) providing a control signal (υ) as output signal, the phase frequency comparator (PFC;28) receiving said output frequency signal (fcom) and a reference frequency signal (fref) as input signals. The slave unit comprises said at least one slave filter (27.1-27.n), the slave filter (27.1-27.n) having a control signal input (41) for receiving said control signal (υ) thus allowing to calibrate the slave filter's transfer function by influencing the slave filter's time constant (τ).
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Le Dinh T.
NXP B.V.
Zawilski Peter
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