Wide frequency range voltage-controlled oscillators (VCO)

Details Wide frequency range voltage-controlled oscillators (VCO) Wide frequency range voltage-controlled oscillators (VCO)

2005-09-13

2005-09-13

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S158000

Reexamination Certificate

active

06943608

ABSTRACT:
A structure for a delay cell in a Voltage-Controlled Oscillators (VCO) and method for operating the delay cell. The delay cell comprises a latch and an impedance circuit (comprising resistance and capacitance elements). The impedance circuit electrically couples different nodes of the latch, a supply voltage, and ground. By adjusting the resistance of the impedance circuit, the time needed for the latch to switch states in response to the switching of an input coupled to the latch is adjusted accordingly. By choosing the appropriate nodes of the delay cell as input and output nodes of the delay cell, the delay time of the delay cell can be adjusted by adjusting the resistance of the impedance circuit. As a result, the operating frequency range of the VCO can be widened compared with prior art. Similar impedance circuits can be added to the delay cell to expand the operating frequency range of the VCO.

REFERENCES:
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5422529 (1995-06-01), Lee
patent: 5614855 (1997-03-01), Lee et al.
patent: 6377129 (2002-04-01), Rhee et al.

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