Current-regulated, voltage-controlled oscillator with duty cycle

Details Current-regulated, voltage-controlled oscillator with duty cycle Current-regulated, voltage-controlled oscillator with duty cycle

1997-02-05

1999-08-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 10, 331 14, 331 17, 331 25, H03L 7085

Patent

active

059429470

ABSTRACT:
A voltage controlled current source provides controlled current to a current controlled oscillator in a high frequency phase-locked loop clock generator. The voltage controlled current source receives a first control signal and a set of second control signals indicative of a phase difference between the output signal of the clock signal generator and a reference frequency. It uses those control signals to adjust the current-controlled oscillator. A level shifter coupled to the current-controlled oscillator amplifies the oscillator signals to full rail and adjusts the duty cycle at its output to 50% to produce the clock signal generator output signal.

REFERENCES:
patent: 5463353 (1995-10-01), Countryman et al.
von Kaenel, V., et al., "A 320MHz, 1.5mW at 1.35V CMO"S PLL for Microprocessor Clock Generation," 1996 IEEE Intl. Solid-State Circuits Conf., "Digital Clocks and Latches," Session 8, Paper FA 8.2, pp. 132-133.

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