RF phase and/or amplitude control device

Details RF phase and/or amplitude control device RF phase and/or amplitude control device

1997-07-31

2000-01-18

Horabik, Michael

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370206, 370207, 375297, 375326, 375327, G01R 3108, H04K 102, H04L 2714

Patent

active

060163046

ABSTRACT:
An RF phase and/or amplitude control device (40) has a digitally controlled attenuator (41) at it input to adjust the overall output level of the output. The device includes an in-phase power divider (43) for splitting up the input signals over two paths (I and Q). The power divided signals in the two paths are further power divided and shifted in relative phase at 180.degree. hybrids (49 and 50). The power divided and phases shifted signals in each path I and Q are selectively switched using switches (51 and 53). The selected and switched output is quadrative combined at a 90.degree. hybrid (55). This provides a single inexpensive device which can provide digitally controlled output signals which are either phase controlled or amplitude controlled or both.

REFERENCES:
patent: 4153886 (1979-05-01), Miedema
patent: 4470147 (1984-09-01), Goatcher
patent: 4581595 (1986-04-01), Silagi
patent: 5019793 (1991-05-01), McNab
patent: 5093636 (1992-03-01), Higgins, Jr. et al.
patent: 5222246 (1993-06-01), Wolkstein
patent: 5355103 (1994-10-01), Kozak

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