← Back to Patent Explorer
US3700931A Expired / Lapsed US ⏱️ 0.0 years remaining

Shift register clocking at high speeds where parallel operation is needed

Assignee: United States Department of the Navy
•
Filing: 1971-11-24
•
Granted: 1972-10-24
•
Expires: 1991-11-24
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A system for clocking a plurality of shift registers in parallel at shift rates up to 10 MHz which employs a single high speed master clock to provide a signal to individual clock drivers. Thus improving the isolation of the master clock and providing a two phase clock needed to drive the individual shift registers. The shift registers to be driven and the driving circuits being mounted in close proximity to each other.

Inventors

  • 👤 Phillip L Watkins
  • 👤 Raymond W Cox

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 14:04
CPC Classifications
G; G11; G11C; G11C19/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 309 words
A digital integrator comprising: a plurality of shift registers being connected so as to operate in parallel; a master clock being connected to drive a high speed clock and a low speed clock; said high speed clock and said low speed clock being gated to supply a single phase clock signal to control said plurality of shift registers wherein said high speed clock is gated to said plurality of shift registers to the exclusion of said low speed clock while when said low speed clock is gated to said plurality of shift registers said high speed clock is blocked; a data line being connected to said plurality of shift registers for supplying parallel data to said plurality of shift registers; a data gate being connected to each of said plurality of shift registers for gating in data and for resetting said plurality of shift registers; each of said plurality of shift registers having an output; each of said plurality of shift registers comprising a plurality of high speed shift registers connected to operate in parallel each of said high speed shift registers having an output, a first input, a second input complementary to said first input, a first phase clock input, and a second phase clock input; a plurality of clock means for receiving said single phase clock signal and for generating a first phase clock signal and a second phase clock signal which are approximately complementary in phase; said first and second clock signals being connected to said first and second phase clock inputs respectively; said clock means being located relative to said high speed shift registers to minimize cross talk data means connected to said data line for receiving said parallel data and for complementing said parallel data; said data means being coupled in parallel to said plurality of high speed shift registers first and second inputs.
Claim 2
Dependent Claim 309 words
A digital integrator comprising: a plurality of shift registers being connected so as to operate in parallel; a master clock being connected to drive a high speed clock and a low speed clock; said high speed clock and said low speed clock being gated to supply a single phase clock signal to control said plurality of shift registers wherein said high speed clock is gated to said plurality of shift registers to the exclusion of said low speed clock while when said low speed clock is gated to said plurality of shift registers said high speed clock is blocked; a data line being connected to said plurality of shift registers for supplying parallel data to said plurality of shift registers; a data gate being connected to each of said plurality of shift registers for gating in data and for resetting said plurality of shift registers; each of said plurality of shift registers having an output; each of said plurality of shift registers comprising a plurality of high speed shift registers connected to operate in parallel each of said high speed shift registers having an output, a first input, a second input complementary to said first input, a first phase clock input, and a second phase clock input; a plurality of clock means for receiving said single phase clock signal and for generating a first phase clock signal and a second phase clock signal which are approximately complementary in phase; said first and second clock signals being connected to said first and second phase clock inputs respectively; said clock means being located relative to said high speed shift registers to minimize cross talk data means connected to said data line for receiving said parallel data and for complementing said parallel data; said data means being coupled in parallel to said plurality of high speed shift registers first and second inputs.
Claim 3
Dependent Claim 22 words
The apparatus of claim 1 wherein: said plurality of shift registers are capable of operating at shift rates up to 10 MHz.
Claim 4
Dependent Claim 28 words
The apparatus of claim 2 wherein: said clock means is located relative to said high speed shift registers to minimize cross talk on the same printed circuit board.

References Cited (Backward Citations)

US3051929A Cited
US3135947A Cited
US3274556A Cited
US3500215A Cited
US3594656A Cited
US3619661A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-24 1976-04-24 1976-10-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-24 1980-04-24 1980-10-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-24 1984-04-24 1984-10-24 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag