Low power programmable ring oscillator

Details Low power programmable ring oscillator Low power programmable ring oscillator

1996-04-25

1998-08-18

Kinkead, Arnold

Oscillators

Ring oscillators

331175, 331183, 331 74, 326 27, 326 81, 327264, 327333, H03B 504, H03L 100, H03L 500

Patent

active

057963134

ABSTRACT:
A novel ring oscillator integrated circuit whose frequency of oscillation is independent of supply voltage, temperature and process technology is described. In addition, the ring oscillator circuit consumes low power and its frequency of oscillation is programmable. The ring oscillator comprises one or more inverter sections cascaded together in series. The output of the final inverter stage is coupled to the input of the first inverter stage. Inserted in the feedback loop is feedback control circuitry which functions to control the start/stop operation of the oscillator. Each inverter section includes a p-channel transistor coupled to a parallel combination of impedance and capacitance, which gives the inverter section asymmetric operating characteristics. This asymmetry helps to achieve a frequency of oscillation independent of supply voltage. A plurality of transistors having predetermined impedance's are coupled in series with the p-channel transistor to form the current limiting impedance. An output buffer provides large drive capability and achieves low power consumption by eliminating normally present crowbar current during switching. Pull-down control circuitry provides individual gate control of each of the transistors making up the current limiter in each inverter section. Process independence is achieved by trimming the plurality of pull-down current limiting transistor so as to attain a particular frequency of oscillation.

REFERENCES:
patent: 4910471 (1990-03-01), Brahmbhatt et al.
patent: 5111085 (1992-05-01), Stewart
patent: 5406228 (1995-04-01), Hoang
patent: 5410278 (1995-04-01), Itoh et al.
patent: 5416446 (1995-05-01), Holler, Jr. et al.
patent: 5441417 (1995-08-01), Korhonen et al.
patent: 5446418 (1995-08-01), Hara et al.

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