PLL modulation circuit

Details PLL modulation circuit PLL modulation circuit

1985-03-25

1986-09-02

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 332 30V, 375 44, 455 42, 455110, 455113, H03C 300

Patent

active

046098860

ABSTRACT:
A phase-locked loop modulation circuit, such as may be used for a data communications purposes, in which undesired level variations are eliminated by employing d.c. coupling entirely. The circuit includes a level converter circuit which converts a logic signal into a signal having substantially equal levels above and below a predetermined voltage, a voltage-controlled oscillator, and a circuit for superposing the signal having substantially equal levels on a control voltage of the voltage-controlled oscillator so that the output of the voltage-controlled oscillator is subjected to angular modulation. In accordance with the invention, the level converter circuit includes a pair of voltage dividing resistors which divide the supply voltage, a pair of series circuit each composed of a resistor and a switch element connected in parallel with each of the series circuits being connected in parallel to a respective one of the pair of voltage dividing resistors, and a gating circuit for complementarily operating the switch elements on and off in accordance with the logic outputs signal.

REFERENCES:
patent: 4546331 (1985-08-01), DaSilva et al.

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