Delay elements arranged for a signal controlled oscillator

Details Delay elements arranged for a signal controlled oscillator Delay elements arranged for a signal controlled oscillator

1998-02-12

2000-12-05

Kinkead, Arnold

Oscillators

Ring oscillators

331177R, 327280, 327281, H03B 524

Patent

active

061572667

ABSTRACT:
A ring-type signal controlled oscillator comprising a series of active delay elements, each including a respective differential pair of transistors. The inputs and outputs of the differential pair transistors are interconnected in a closed ring to produce oscillations at a frequency determined by the delay of each delay element. The differential pair of transistors further has a pair of current source inputs for controlling an amount of delay of the delay element, and a pair of load inputs for stabilizing the amount of delay. The invention advantageously provides high frequency operation with substantially symmetric rise and fall time, while limiting spread in oscillation frequency and spread in amplitude in relation to fabrication process variability and power supply variability.

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