Voltage controlled oscillator delay cell and method

Details Voltage controlled oscillator delay cell and method Voltage controlled oscillator delay cell and method

2008-07-15

2008-07-15

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S052000, C327S287000

Reexamination Certificate

active

07400183

ABSTRACT:
A delay cell circuit (200) is disclosed. The delay cell circuit may include a differential stage (202) and a cross-coupled stage (204). The cross-coupled stage can include resistors (210-0and210-1) the function to reduce a gain. The differential stage (202) and cross-coupled stage (204) can include variable currents sources (208and212), respectively. As frequency of operation increases, variable current source (208) provides a larger current to the differential stage (202) and variable current source (212) provides a smaller current to cross-coupled stage (204). Delay cell circuit (200) may be used in a voltage controlled oscillator (VCO). By including gain attenuating devices such as resistors (210-0and210-1), a frequency tuning range of the VCO may be increased.

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