Voltage controlled ring oscillator frequency multiplier

Details Voltage controlled ring oscillator frequency multiplier Voltage controlled ring oscillator frequency multiplier

1997-02-18

1998-06-09

Nelms, David C.

Oscillators

Ring oscillators

331 60, 331108C, 331 1A, H03B 2700

Patent

active

057641110

ABSTRACT:
A voltage controlled ring oscillator (10) integrated with a phase locked loop (101) using CMOS technology. The ring oscillator (10) provides a frequency multiplied harmonic output frequency (42) at a frequency of 2.5 GHz or more while operating at only one-third of that frequency. The ring oscillator (10) uses an odd number of inverter stages (12, 14, 16) and provides high frequency CMOS operation by utilizing the phase shifted signals of the ring frequency at each ring inverter output (20, 24, 28). The ring oscillator (10) draws minimal current and is incorporated in a frequency synthesizer (100) used in a radio communication device (200).

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patent: 5668504 (1997-09-01), Rodriques Ramalho

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