Oscillators – Ring oscillators
Patent
1992-02-18
1993-05-04
Grimm, Siegfried H.
Oscillators
Ring oscillators
3072962, 331 74, 331179, H03B 524, H03K 3354
Patent
active
052085570
ABSTRACT:
A multiple frequency oscillator responds to a control signal to selectively produce an output signal having a first frequency or a second frequency. The oscillator includes a plurality of inverter stages (48.sub.1 -48.sub.5) with the input of each inverter stage coupled to the output of another inverter stage. At least one of the inverter stages includes first and second transistors (50,51) having current paths connected in parallel, a third transistor (52) having a current path connected in series with the current paths of the first and second transistors (50, 51) between a first voltage source (Vdd) and the inverter stage output, and a fourth transistor (53) having a current path connected between the inverter stage output and a second voltage source (Vss). The control electrodes of the first, third, and fourth transistors (50, 52, 53) are connected to the input of the inverter stage. A control signal controls the conductivity of the second transistor (51) to select the frequency of output signal of the oscillator (44).
REFERENCES:
patent: 3931588 (1976-01-01), Gehweiler
patent: 4585954 (1986-04-01), Hashimoto et al.
patent: 4631421 (1986-12-01), Inoue et al.
patent: 4656369 (1987-04-01), Lou
IBM Technical Disclosure Bulletin, vol. 32 No. 4A Sep. 1989, pp. 410-411 "Frequency Modulated Ring Oscillator For A Mode Regulated Substrate Bias Generator".
Barndt B. Peter
Brady III W. James
Donaldson Richard L.
Grimm Siegfried H.
Texas Instruments Incorporated
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