Symmetric load delay cell oscillator

Details Symmetric load delay cell oscillator Symmetric load delay cell oscillator

2011-04-12

2011-04-12

Pascal, Robert (Department: 2817)

Oscillators

Ring oscillators

C331S109000, C327S266000, C327S280000

Reexamination Certificate

active

07924102

ABSTRACT:
An oscillator includes a control circuit and a ring of symmetric load delay cells. Each delay cell includes two novel symmetric loads. Each load involves a level shift circuit and a diode-connected transistor coupled in parallel with a current source-connected transistor. The control circuit converts an oscillator input signal into bias control signals that in turn control the effective resistance of the symmetric loads such that delays through the delay cells are a function of the input signal. The control circuit uses a symmetric load replica in a control loop to control the level shift circuits of the delay cells such that the oscillating delay cell output signals have a constant amplitude. In a first advantageous aspect, due to the constant amplitude, the oscillator is operable over a wide frequency range. In a second advantageous aspect, the oscillator input signal to output signal oscillation frequency has a substantially linear relationship.

REFERENCES:
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patent: 6900703 (2005-05-01), Garvin
patent: 7295079 (2007-11-01), Wu et al.
patent: 7310020 (2007-12-01), Tan et al.
patent: 7567140 (2009-07-01), Kim
patent: 7719370 (2010-05-01), Takai

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