Beamforming circuitry

Details Beamforming circuitry Beamforming circuitry

1998-11-23

2000-01-04

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

333 81R, 333 81A, H01Q 322, H01Q 324, H01Q 326

Patent

active

060115130

ABSTRACT:
Digital control of analogue beamformers utilising PIN diodes in a shunt circuit bi-phase attenuator arrangement is difficult because of the diodes extremely non-linear control response. There is disclosed a PIN diode circuit arrangement comprising a digital to analogue converter (DAC) with a reference voltage controller arranged to vary the DACs response to digital input signals to compensate for the PIN diode's non-linear response making this look substantially linear in the digital domain. The circuit preferably incorporates a feedback arrangement from the output of the DAC to its reference voltage input.

REFERENCES:
patent: 4903032 (1990-02-01), Multedo et al.
patent: 5117377 (1992-05-01), Finman
patent: 5565823 (1996-10-01), Fratti

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