Apparatus for shifting the phase of transmitter and receiver ana

Details Apparatus for shifting the phase of transmitter and receiver ana Apparatus for shifting the phase of transmitter and receiver ana

1985-09-23

1988-04-05

Lall, Parshotam S.

Boots, shoes, and leggings

324307, 324314, 307511, 328155, G01R 2300, G01V 300, G05F 500

Patent

active

047363282

ABSTRACT:
Apparatus for shifting the phase of a phase-quadrature signal pair, in at least one of the transmitter and receiver of an NMR system, uses a circuit for shifting the phase of each of the pair of signals by a substantially similar amount responsive to a control signal, and a microcontroller for programmably establishing the control signal data to provide a desired phase shift. Typically, the control signal is of digital data nature and the phase shifter operates to shift signal phase through an angle equal to a selected multiple N of a basic angle. The basic angle is selected such that a plurality of equal angle increments are established by the resolving properties of the data signal. A plurality of phase shifters can be controlled by a single microcontroller.

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patent: 4647789 (1987-03-01), Upadhyayula
patent: 4672318 (1987-06-01), Sekihara et al.

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