Modem having a phase corrector and a voltage controlled oscillat

Details Modem having a phase corrector and a voltage controlled oscillat Modem having a phase corrector and a voltage controlled oscillat

1994-07-25

1995-08-01

Mis, David

Oscillators

Polyphase output

331 57, 327254, H03B 524, H03B 2700

Patent

active

054383013

ABSTRACT:
A carrier generator circuit for use in a modem employed in a wireless communication system is described. The carrier generator circuit includes a voltage controlled oscillator comprising an N-stage ring oscillator to generate N balanced vectors of equal magnitude and arbitrary phase difference. The carrier generator circuit also includes a phase corrector to add two of the balanced vectors to generate a sum vector and to subtract the two balanced vectors to generate a difference vector. The sum vector and difference vector have a phase difference of 90 degrees. The sum vector represents an I (in-phase) carrier signal component and the difference vector represents a Q (quadrature-phase) carrier signal component. These I and Q carrier signal components can be used to transmit and receive data signals.

REFERENCES:
patent: 3976958 (1976-08-01), Seidel
patent: 4015222 (1977-03-01), Werner
patent: 4782531 (1988-11-01), Karr et al.
patent: 4806888 (1989-02-01), Salrage et al.
patent: 5157344 (1992-10-01), Ichihara
patent: 5180994 (1993-01-01), Martin et al.
patent: 5298870 (1994-03-01), Cytera et al.

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