Integrated circuit delay chains

Details Integrated circuit delay chains Integrated circuit delay chains

2006-12-26

2006-12-26

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S513000, C327S290000, C327S284000

Reexamination Certificate

active

07154324

ABSTRACT:
Delay chain circuitry is provided. The delay chain circuitry has a number of delay chain inverters. Each delay chain inverter is connected in series with a load resistor and has an associated capacitor between its input and ground. The electrodes of each capacitor may be formed from metal separated by non-gate-oxide dielectric to maintain accurate capacitor tolerances. A stable current source such as a bandgap reference current source may apply a current to a sensing resistor. The resulting bias voltage is indicative of changes in resistance due to changes in operating temperature. A temperature compensation circuit may use the bias voltage to produce temperature-compensation control signals. The temperature-compensation control signals are applied to the delay chain inverters to adjust their resistances and compensate for temperature-induced changes in the resistances of the load resistors. This ensures that the delay of the delay chain is independent of operating temperature.

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