Notch filter for reducing clock signal feedthrough effects in an

Details Notch filter for reducing clock signal feedthrough effects in an Notch filter for reducing clock signal feedthrough effects in an

1990-05-29

1991-07-02

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333170, 333171, 333193, H03H 701

Patent

active

050288954

ABSTRACT:
A notch filter for reducing clock signal feedthrough effects in an acoustic charge transport (ACT) device. This notch filter is included on the same substrate as an ACT device. This notch filter may be employed to remove clock signals which have greater voltage than the data signals in an ACT device. This notch filter may be employed either at the input or the output of the ACT device. The notch filter includes a bridge connection of surface acoustic wave transducers and RC networks on opposite sides of the bridge configuration. Each side of the bridge is balanced so that at the notch filter frequency, the voltage output by each side of the bridge is one-half of the input voltage and in phase. These voltages produced by each half of the bridge are differenced and a zero output voltage is produced at approximately a notch or center frequency.

REFERENCES:
patent: 4314215 (1982-02-01), Tanji et al.
patent: 4577168 (1986-03-01), Hartmann
patent: 4599587 (1986-07-01), Hartmann et al.
patent: 4694266 (1987-09-01), Wright
Plass, "Acoustic Surface Wave Band-Stop Filter for UHF Freq.", 1973 European Microwave Conf., vol. II, Belgium, Sep. 4-7, 1973.
Hartmann et al., "Saw Notch Filters", 1987 Ultrasonics Syposium, pp. 131-138.

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