Monolithic broadband phase shifting circuit for analog data sign

Details Monolithic broadband phase shifting circuit for analog data sign Monolithic broadband phase shifting circuit for analog data sign

1993-10-12

1995-04-18

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

327255, 327335, 327 99, H03H 1116

Patent

active

054081920

ABSTRACT:
An accurate phase shifting circuit providing two analog signals having a 90-degree phase shift between them from a single sampled-data input without the need for components external to a monolithic integrated circuit. A combination of two discrete-time circuits achieves the required 90-degree phase relationship over a broad frequency region. Several sample-and-hold circuits and multiplexors are used to produce two discrete-time versions of the analog input signal. Subtracting that older sample from the most-recent sample yields a forward difference signal and adding the most recent and the older samples produces a forward average signal. The phase difference between any single-frequency component of the forward difference and forward average signals is always 90 degrees. A pair of matched filters serves to reconstruct the sampled analog waveforms and to remove unwanted high-frequency noise in the +90.degree. output signal.

REFERENCES:
patent: 2905837 (1959-09-01), Barry
patent: 4968908 (1990-11-01), Walls
patent: 5051702 (1991-09-01), Iwasaki
patent: 5332975 (1994-07-01), Young et al.
Carlos A. Laber & Paul R. Gray, A 20-MHz Sixth-Order BiCMOS Parasitic-Insensitive Continuous-Time Filter and Second-Order Equalizer Optimized for Disk-Drive Read Channels, IEEE Journal of Solid-State Circuits, vol. 28, No. 4, Apr. 1993, pp. 462-470.

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