Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1993-03-25
1994-10-04
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
3072968, 323315, 323317, 341144, H03M 166, G05F 316
Patent
active
053529340
ABSTRACT:
For use in integrated circuit systems wherein both filter time constants and oscillator frequency each need a suitable reference, both the filter and the oscillator are referenced to common reference circuitry through a suitable control loop. Because the fundamental control parameters of the oscillator and the filter are time-period and time-constant respectively, the oscillator and the filter are implemented in a manner where the monolithic passive elements setting the fundamental control parameters (time-period and time-constant) are of the same type. This has the advantage of close tracking through process and ambient variations. Monolithic capacitors on the same chip are used as one of the common passive elements between the oscillator and the filter to set the time-period and time-constants, respectively, adjustable through adjustment of control currents. The monolithic implementation of the Control Block is such that by tuning the oscillator frequency to the appropriate value through setting of the respective control current, the filter time-constants also are appropriately set to satisfy the Nyquist criteria for a sampling rate referenced to the oscillator frequency. Trimming and tuning are accomplished by digital control to control the summing of appropriate current components after manufacture, such as by the programming of on-chip storage cells provided for this purpose.
REFERENCES:
patent: 4608530 (1986-08-01), Bacrania
patent: 4701694 (1987-10-01), Penney et al.
patent: 4712091 (1987-12-01), Schoofs et al.
patent: 4827260 (1989-05-01), Sugawa et al.
patent: 4874964 (1989-10-01), Kondo
patent: 4914317 (1990-04-01), Agiman
Callahan Timothy P.
Information Storage Devices, Inc.
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