High precision continuous time g m C BPF tuning

Details High precision continuous time g m C BPF tuning High precision continuous time g m C BPF tuning

2008-01-15

2008-01-15

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S229000, C375S373000, C375S374000

Reexamination Certificate

active

10805915

ABSTRACT:
High precision continuous time gmC BPF (Band Pass Filter) tuning. A novel approach is presented by which a continuous time signal serves as a BPF control voltage for tuning of a BPF within a communication device (e.g., transceiver or receiver). A PLL (Phase Locked Loop) tunes the center frequency of the BPF using this continuous time signal, and the PLL oscillates at the center frequency of the BPF. The BPF is implemented as a gmC (transconductance-capacitance) filter, and the PLL is implemented using a number of gm(transconductance) cells as well. The PLL's gmcells and the BPF's gmcells are substantially identical in form. All of these gmcells are operated within their respective linear regions. This similarity of gmcells within the PLL and the BPF provide for substantial immunity to environmental perturbations including temperature and humidity changes as well as fluctuations of power supply voltages.

REFERENCES:
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patent: 2002/0008572 (2002-01-01), Hayashi et al.
patent: 2002/0011896 (2002-01-01), Yokoyama et al.

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