Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2007-09-04
2007-09-04
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
10557346
ABSTRACT:
A transconductor circuit, such as a gyrator filter, comprises an arrangement of balanced class AB transconductors, capacitors and floating MOS resistors formed by MOS transistors operating in their triode region. Tuning of the filter is effected by varying a common supply rail voltage. The circuit includes a means for producing a voltage offset from the common mode voltage of the class AB transconductors. The offset voltage is supplied to a parallel arrangement of a class AB transconductor having a transconductance and the source-drain path of a MOS transistor emulating a MOS resistor. The current output of the parallel arrangement is integrated and supplied as a control voltage to the gate electrode of the MOS transistor. By loop action the control voltage is adjusted and supplied to the floating MOS resistors.
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J.B. Huges et al, “1mW CMOS Polyphase Channel Filter for Bluetooth”, IEE Proc. Circuits Devices Systems, vol. 149, No. 5/6, Dec. 1, 2002, pp. 348-354.
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