Noise-shielding, switch-controlled load circuitry for...

Details Noise-shielding, switch-controlled load circuitry for... Noise-shielding, switch-controlled load circuitry for...

2006-11-07

2006-11-07

Chang, Joseph (Department: 2817)

Oscillators

With particular source of power or bias voltage

C331S057000, C331S186000, C331S045000, C327S272000, C327S278000, C327S254000, C327S281000

Reexamination Certificate

active

07132903

ABSTRACT:
A set of interconnected delay stages, such as a voltage-controlled oscillator, has switch-controlled load circuitry connected to each output of each delay stage in the oscillator ring. In one embodiment, for each delay stage output, the switch-controlled load circuitry includes a switch, a transistor, and a current source. The switch is connected between the corresponding delay stage output and the transistor gate, the current source is connected between a power supply and the transistor drain, and the transistor source is connected to ground. In such a configuration, the transistor's gate-to-source capacitance can be applied to the corresponding delay stage output by closing the switch, for example, for lower-frequency operations. In addition, the output impedance of the current source decouples the capacitive load from the power supply, thereby substantially shielding the oscillator ring from noise in the power supply.

REFERENCES:
patent: 5440260 (1995-08-01), Hayashi et al.
patent: 6150862 (2000-11-01), Vikinski
patent: 6163226 (2000-12-01), Jelinek et al.
patent: 6191630 (2001-02-01), Ozawa et al.
patent: 6373342 (2002-04-01), Tran
patent: 2001/0045856 (2001-11-01), Ooishi

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