Electronic circuit with low noise delay circuit

Details Electronic circuit with low noise delay circuit Electronic circuit with low noise delay circuit

2006-12-12

2009-08-04

Luu, An T (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S161000, C327S278000, C331S043000, C331S157000

Reexamination Certificate

active

07570097

ABSTRACT:
An electronic circuit comprises a delay circuit that with a chain of saw tooth delay stages (10a-d), coupled in a loop to form an oscillator for example. Each stage comprises an integrating circuit (104) and a current modulator (106) coupled to the integrating circuit (104). Each stage triggers a transition in the next stage when the integration result reaches a level defined by a reference voltage. Correlating circuitry (102, 30, 32, 34) is provided with current outputs to generate currents to the current modulators (106) and reference voltages for the saw tooth delay stages (10a-d). The reference voltages are generated at least partly from a common reference (102c), so that noise in the currents from the current modulators (106) and reference voltages is correlated in a way that at least partly cancels the effect of the noise on the delay time.

REFERENCES:
patent: 5686867 (1997-11-01), Sutardja et al.
patent: 6107894 (2000-08-01), Van Tuijl et al.
patent: 6191630 (2001-02-01), Ozawa et al.
patent: 7205855 (2007-04-01), Maruyama et al.
patent: 2005/0057315 (2005-03-01), Groen et al.
patent: 0813303 (1997-12-01), None

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