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US 5,291,083 AGranted
Bucket brigade analog delay line with voltage limiting feedback
AssigneeHewlett-Packard Company
InventorsTravis N. Blalock, Thomas Hornak
Life of this patent
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AssigneeHewlett-Packard Company
InventorsTravis N. Blalock, Thomas Hornak
Estimating the term…
A bucket brigade analog delay line with voltage limiting feedback includes an input stage for receiving an input signal and a series of delay stages coupled to the input stage for propagating the input signal through the line. Each delay stage contains a storage capacitor for holding either a signal charge or a reference charge, a transfer device for transferring charge from one stage to another at regular clock intervals, and a tap circuit for allowing external sampling of the propagated input signal. Each delay stage also includes a negative feedback amplifier for maintaining the drain terminal of the transfer device at a constant potential during charge transfer, thereby eliminating errors caused by finite output impedance of the transfer device. The negative feedback amplifier also prevents overvoltage conditions which could result in failure of the charge transfer devices.
A clocked bucket brigade analog delay line having an input stage for receiving a signal and a plurality of delay stages coupled to the input stage for propagating the signal through the line, each delay stage comprising:
The bucket brigade analog delay line of claim wherein the charge transfer device is an n-channel enhancement-type MOSFET.
The bucket brigade analog delay line of claim wherein the negative feedback amplifier comprises a plurality of transistors incorporating positive feedback.
The bucket brigade analog delay line of claim wherein the negative feedback amplifier comprises:
A bucket brigade analog delay line having a plurality of stages for receiving and propagating an input signal through the line at regular intervals defined by at least one clock having a clock voltage range, each stage comprising:
The bucket brigade analog delay line of claim wherein the voltage negative feedback device further comprises a positive feedback FET coupled to the gain FET for enhancing the amplifier gain.
A bucket brigade analog delay line for delaying the passage of a signal through a circuit, the delay line comprising:
A bucket brigade analog delay line comprising:
Dependencies are inferred from the claim text.